Le Cellier is going to be your issue. I called today as my 90 days out and only had it available for 7:35 and it was nearly booked solid. I would reccomend you booking something to replace and then you could keep calling to see if there's a cancellation...but at least you'd have something to fall back on. Chef Mickeys is hard too, but its more difficult for breakfast than dinner.
For Wednesday:
You could go to Downtown Disney and eat somewhere like Bongos, Rainforest Cafe or T-Rex Cafe, and those should fit into your budget. You could also do some type of buffet dinner at one of the resorts. Somewhere like 1900 Park Fare at Grand Floridian or Ohana at the Poly (another difficult one to get). But Downtown Disney is a nice place to enjoy an afternoon, hence the dining suggestions there.
Thursday:
Good breakfast, call today if you can and book it. Hint, if you look at the park hours (park likely opens around 9am), you can actually book the breakfast earlier. They will let you into the park to go to breakfast and then it doesn't eat into too much of your park time.
As for Le Cellier, party of two is actually more difficult to get, as there are fewer two-seat tables. Booking for 3 people actually opens up more seats than booking for 2. As an alternative, might I reccomend Chefs De France. It has a very good menu and is a popular spot as well...but you should be able to get something there if you call soon(today).
Friday:
Chef Mickeys can be tricky, but usually harder for breakfast than dinner...so again, get it booked.
You have some very good dining options in mind, and very popular ones as well. Remember, if something is booked, get an alternative reservation, as you can always cancel it later if you get your first choice.
Some good snack ideas include the Dole Whip...a Disney snack that has reached cult status. The Orange Slushys at France in Epcot is wonderful, but its alcoholic so not included for the snack option. Also in france, the bakery is incredible, I love their Chocolate Mousse, and most of what they have is a snack credit.
By the way, you can have a look at dining menus here:
Disney Dining Menus
I'd better stop before I write my book right here on the boards. Let me know what you think and then we'll move on from there.
Cheers!!!