To answer OP's question:
160 is the minimum buy-in at AKL. 10% downpayment is required but can be put on a credit card. You can choose $104/pt and get developer points (extra points, basically), or $96/pt and no developer points. Maximum interest rate through WDW is 14.75%. Preferred (lowest) is 10.75%.
Annual dues at AKL are $4.62/pt, per year, so $739.20/12 = $61.60 added to monthly payment, for dues.
160 w/ developer points: buy-in is $16,640. Subtract 10% downpayment (minumum) of $1,664, add closing costs of $340, total to be financed is $15,316. 10 yr loan at max rate would be $244.76/month, $306.36 w/ dues. Min rate is $208.82/month, $270.42 w/dues.
160 w/out developer points: total to be financed is $14,144 (subtract downpayment of $1,536, add closing costs). Payment on max interest rate would be $226.03, $287.63 w/ dues. Min rate is $192.84 or $254.44 w/ dues.
So maximum payment is $306.36 for 10 years. FWIW, the total interest payments over the 10 years for those terms comes to $14,055. All interest is tax deductible but if you don't already itemize, probably won't help you any on your taxes.
Most traditional banks won't directly finance timeshare purchases. You can do a home equity, direct through Disney, or use a third party (we used Benchmark Bank thru the TSS, at 9.95% preferred on a 5 yr loan).
HTH!
-Kat