First thing I would have you do is look at what your Disney routine is... do you have to go on weekends and holidays? if you do it may reduce the value of your points in half or worse. If you have a flexible schedule re: vacation it maybe a better fit. Do you have school age kids that must go at peak times?
secondly, the prospect of trading to 600 places and cruises sounds great but is not a thrifty way of using points either. We get 13-18 days a year from 150 points in a studio the times we go...trade with II for a 1br for 7 days and its 160 points...Concierge collection can easily cost 30 points a night or 5 DAYS a year! Great variety but horrible waste IMHO. If you are buying
DVC to trade you could get better value buying almost any another timeshare company.
Thirdly, perks are perks and don't count on them...when I bought people even reminded me that booking other DVC resorts was a perk that could be taken away if Disney suddenly turned into an Evil Queen. Exceptionally unlikely but possible.
Lastly, use the advantage of your time before your purchase to watch the market, consider resales and take advantage of the deals when the recession gets worse. Bargains come and go and we missed (by 1 month) buying SSR from Disney for the same price we paid in resale. 1 year later and I saw one better value than that since. The most recent deal for $500 Gift card stinks IMHO. Be patient and remember even a 25 point contract will let you buy the KT at the contemporary with no closing costs.
DVC was one of the best decisions we ever made, we will have gone to WDW 3 times this year, and we look forward to doing it till 2054...when I'll be 82.
I look forward to saying "welcome home"
BOB