Ultimately it is your decision, but here are my thoughts on it:
1) Don't buy AKV for concierge. Without owning at AKV, you will likely never get it, but even if you own there, it would still be a rare treat that you would get to experience only a very few times over the life of the contract. Maybe once every 5 years-10 years. From what i've read, you simply get daily maid service, and a selection of refreshments. A nice treat, certainly, but I wouldn't consider it worth it in the long run.
2) The initial price isn't going to make that much of a difference in the long run. If AKV is only $2 per point cheaper than BLT, then BLT's $1/pt less expensive annual dues will make up for that in just 2 years. After that BLT will be cheaper.
3) Getting in to AKV most likely won't be difficult. It is the 3rd largest
DVC resort, next to SSR and OKW. SSR has 1,320 rooms available. OKW has 761 rooms available. AKV has 708 rooms available. While BLT has 428 rooms available. Unless you absolutely must have concierge or want one of the value rooms, then I wouldn't worry about getting in to AKV. It'll be just like SSR and OKW: That's where there will be a room when there isn't a room anywhere else. However, getting in to BLT during peak times will likely be very difficult. MK view anytime during the Christmas season will likely be impossible, unless you own there. I could also see it becoming popular for F&W since it's monorail access to EPCOT. All of that is speculation, but I think my reasoning is sound.
4)
BLT does NOT have computers in the rooms. This is an amenity of the Contemporary Resort rooms, but NOT the BLT rooms. You will still have free internet while you are staying.
5) As others have said, BLT's lower dues will be eaten up by the higher point per night room costs. However, when you use your BLT points outside of BLT, like at AKV, then you will get a bargain. If you use your BLT points at OKW, then it will be a REALLY good bargain. However, those who use their AKV points at BLT won't get such a good deal.
6) BLT most certainly has it's location going for it: All the restaurants at the contemporary. A quick monorail ride to ALL the restaurants of the MK, Grand Floridian, Poly, and EPCOT. A quick boat ride to Wilderness Lodge and Fort Wilderness. A quick 5 minute walk to the MK bus stops (or take the monorail if you're feeling particularly lazy) to any other resort. That's quick and easy access to two parks plus 5 resorts (contemporary, poly, GF, WL and Fort Wilderness) for Dining and pool hopping or just resort exploration. If there is any one resort that is at the center of WDW transportation, it is DEFINITELY the Contemporary.
#6 is what sealed the deal for BLT for me. Convenience for almost everything on WDW property. With AKV, you are out in the middle of nowhere. The buses are dedicated, and from what i've read they are good, but you are still at least 2 bus rides from any other resort, it's the furthest resort from the MK and EPCOT. The Animal Kingdom Park is the only thing it's convenient to.
Also imagine that you've had an exhausting day at the MK. You've watched Spectro, and Wishes JUST ended. You were right at the castle to watch the fireworks, but you've now got all of Main Street ahead of you for the bus back to AKV. You'll have to wait about 30 minutes (or more) for a bus, you MIGHT get lucky and get a seat. And if you don't it's another 30 minutes back to the resort on the bus. Your feet crying the whole time. Or, you could just take the 5-10 minute walk back to BLT and be back to your room and soaking in the hot tub within 15 minutes
We were faced with the same dilemma - and we split our contract between the two!!
Because of this, we never rent a car at WDW and always take DME from the airport. Staying at BLT offers so many transportation options for the "carless".
), but that feeling has dissipated since none of the attractions in FW are the same anymore. Anyway, I am so thrilled that I will now be able to stay next to the one place that provides me with so many fond memories. 
