Another thing to consider, just because you have some NE tickets left over, doesn't mean you need to use them on these trips. With 2 trips planned within the year, I'd say go with the AP and then save the NE tickets you still have for your NEXT trip.
I've got trips planned in March and november of next year. I stay off site, and I remembered in my initial calculations that it was cheaper for me to get an AP than it was to get a 3day Park Hopper on both trips, and I just about broke even on a 6day PH/NE ticket. This was pre-august price increases, and the AP didn't get hit with an increase like the MYW tickets did. I also had to factor in my $14/day parking since I stay off site, so if you are on-site you may be a bit further from the break-even point than I was.
I also didn't factor in the additional AP discounts into my calculations since it's harder to know exactly how much I'd spend on food or other goodies which I'd get a percentage discount, or even know if i'd take the time to go to a Water park, Disney Quest, or a hard ticket event which I'd get a discount on.
Easiest way to figure it out, just go t the Disney website and see how much the AP costs, and then compare this to the MYW tickets you'd get. Your 2 options would be either seperate tickets for each stay, or to look at a NE ticket which could bridge between the 2 trips.
The AP has the advantage of also removing your hestitance to do a part-day trip. say you arrive at 5pm in the area. Normally you'd be concerned about "wasting" a day on your ticket for just a couple hours at the park, where with an AP it doesn't matter so you can go for just a couple hours your arrival or departure day and not stress about it. It also opens up the possibility for weekend getaways. See a cheap flight? have a long weekend at work? close enough for a drive? Head down to the world and spend a day or two at the parks. Between the big room discounts you might be able to get with your AP, or the fact you can stay at an inexpensive off-site hotel and not worry about paying for parking, a quick getaway could be a lot more affordable.
And don't underestimate the Tables in Wonderland card. As others have said, $75 can save you (and your 10 closest friends) 20% on all your table service dining, including apps and adult beverages. That adds up quickly and you'll be breaking even pretty quickly. Now, with TiW an 18% Gratuity is automatically added, but by comparison tips aren't included with any dining plan (Free or paid) so you'd still need to pay for tips on a plan.... plus you aren't locked into what you can and can't order under a dining plan.... or limited to only certain beverages. If you enjoy drinking at all (wine, mixed drinks, whatever), the 20% off your drinks can add up quickly. (While not commonly stated, there are also a few CS places you can use your TiW card as well, including the Flame Tree BBQ.)