My Linksys WMP54G v4 isn't working out and I still can't connect to the internet. I might as well buy a new cared.

Could somebody please point me towards the best one to buy?

(Note: I have a vanilla install on a
Dell Dimension 8400
Intel Pentium 4
ATi Radeon x550 graphics (or something like that)
Creative Audigy SB sound)