I think you've chosen a great mix! Are they all dinners?
Chef Mickey - I consider Chef Mickey's the "quintessential" Disney character meal. It's in the middle of the Contemporary Resort, and, while you're eating, the monorail runs through the resort above where you're sitting. Your girls will probably love that! The characters you'll probably see are Mickey, Minnie, Pluto, Chip, & Dale, and I think Goofy is in the lobby. There are also lots of fun things going on like napkin twirling which your girls will enjoy. We ate here for breakfast last year, and the characters seemed a little rushed. But, that's probably a "hit or miss" kind of thing. This year, we're trying dinner. It is a buffet, and I've read mixed reviews on the buffet selections. But, again, that's probably "hit or miss"...
1900 Park Fare - We've never eaten here, but it's on my list to try. The dinner is w/ Cinderella & Prince Charming & Suzy & Perla (maybe the Fairy Godmother too). I'm not sure if all the characters circulate around the dining room or if some just stay in the lobby. It's located in the Grand Floridian which is a gorgeous resort. It's another buffet, but, generally, I've read really good reviews on this one.
Akershus (SP) @ Epcot - We ate here for dinner last year, and, this year, we're trying breakfast. The only difference in characters at breakfast is that I think Ariel only shows up at lunch & dinner. Otherwise, the characters are normally a mix of all the princesses except Cinderella. However, last year, Snow White wasn't there, and Cinderella was "subbing" for her when we were there. The restaurant is lovely - very nice setting - large & spacious. And the character interaction was very good. However, we weren't impressed w/ the food at all at dinner. And I was very glad we had the dining plan - if not, we would have paid $13.00 for DD to eat a PB & J "uncrustable" & for DS to eat a $13.00 hot dog! LOL! Neither DH nor I really liked our dinners - my chicken & pasta was kind of dried out & clumpy - not tasty at all! DH says his was just "okay". The desserts, though, were scrumptious!
Ohana - This is only a character meal at breakfast, but dinnertime is fun too! There's hula hoop contests & fun things like that. Even though we had an ADR, we waited extra for a table where we could see the castle which was quite nice. It was very crowded, and we had an earlier ADR. Even w/ our ADR, we probably waited 45 minutes before we were seated. Once we were seated, our waiter brought the kids little drink umbrellas w/ which to play, but he wasn't too keen w/ bringing them something else to eat besides the "all you can eat" adult selections. (He did finally bring them something else.) The Poly is another nice resort to visit. Originally, we were going to stay & watch Wishes from the beach at the Poly, but we decided to go back to the beach at FW.
Garden Grill - We're trying this for the 1st time this year as well. The characters look fun - Mickey & Chip & Dale & Pluto or Goofy, I think. At one time, this restaurant slowly revolved & overlooked "Living w/ the Land" ride which was kind of neat. I'm not sure, since the renovations, if it does this still or not.
Wispering Canyon - This looks like another very fun restaurant. We haven't tried it yet, but it's on my list! This restaurant always gets rave reviews. And it looks like it has a great family-fun atmosphere!
Our other favorite character meals are Crystal Palace w/ Pooh & Friends in the MK and Liberty Tree Tavern w/ Minnie & Goofy in the MK.
I thing your selections looks really good and will be lots of fun for your daughters! And you've got a nice variety of characters & fun meals. The only thing I would perhaps question is the later ADR times, but, if your girls are used to eating later dinners, it shouldn't be a problem. (W/ our kids, I have to make our dinner ADR's for earlier, so we don't have "meltdowns".

) Also, the later your ADR is, the longer you may have to wait before you're seated.
Depending on what time of year you're going, Wishes normally begins at 10:00 pm. If you're going to watch the show from the park, you need to allow enough time to get in the park & find a good viewing spot for your family. The night-time parade (Spectro) takes place about an hour usually before Wishes, so people will "camp out" waiting for Spectro & then stay for Wishes. When we were there in May last year, by 8:00 pm, Main Street was getting crowded w/ people waiting for the parade.
In Epcot, people were waiting for Illumimations by 8:00 pm as well.
But, again, all that depends on the time of year you're going.
I don't think you can see Wishes from Chef Mickey's (I could be wrong though), but you can see Wishes from Ohana's. You probably would not be able to see Illuminations from inside Akershus.
Hope this helps!!