Please, Which USB adapter works WELL with Vista -64 bit as of September 2009?

Hi all im sure many have asked this question but they all seem to be a little out of date..well i just got a new XPS 630 PC in August 23rd..and its running on Vista-64 this is the first time i've ever used it so my problem was orignally i had netgear router G..and a WPN111 adapter...at first i had no internet..we fixed the router G..got internet ..then a day later the WPN111 started to give out and drops signal constantly, i went through so many calls between netgear and dell..Dell claims its netgears fault..netgear claims its dell's fault my internet is not working..so i did research heard that the linksys Wireless-N USB network adapter with dual-bran works well so i got the WUSB600N..works well if your sitting right next to your router..like 10 feet away it will drop signal constantly its horrible..so..because the router G is on the first floor and im on the second floor..i thought maybe it was the range ..and stuff..cause the linksys worked but lost constantly ...so i bought the Wireless-N Gigabit Router model: WRT310N works amazing has great range but yet my linksys adapter still looses connection it looses it less then when i had the G router but it looses it every 60 seconds-15 minutes and its reallly annoying..please somebody who has an adapter..working with Vista 64-bit..please tell me the brand name and modelll! im willing to pay anything under $200 i figure most go for like 60-100 anyways...well if you have read all this thank you and thank you for any advice you may have for me