Best wireless card or USB adapter for a desktop ???

hey all

I have a belkin wirelss home router that seems to all be working fine down stairs. Upstairs i have a HP desktop computer that i used to run a linksys usb adapter with LINKSYS WUSB54GS at PC World - Cheap Wireless Network Cards - LINKSYS WUSB54GS WIRELESS 125MBPS USB ADAPTER WITH SPEEDBOOSTER well i never got very good singal and it always was cutting me off for some reason. I did try moving it into diffrent spots of the room and didnt make it any better. I also have a Advent laptop with a intel pro wirelss 2200BG built into it that i some times use at the same desk if i cant get my desktop 2 work, the laptop always has full signal and works perfect. So im kinda thinking its the USB adapter.

I was just wondering what would be a good card or adapter to buy for my desktop to get the same sorta singal and speed i do with my laptop? i dont want to buy a adapter or card and have the same problem that im having now with my linksys 1 atm

any help would be great