Been there...
I fixed up two daughters with WiFi at their homes, one clergy friend, and my home and hideaway cottage.
Belkin was consistently dreadful, and has now been thrown out. The rest is a mix of allsorts, and all have been fine.
The Netgear DG834G I bought for me has dud sockets - if the cables are held in tight with rubber bands (ooer!) then it's OK. Otherwise, it drops and reconnects at random. Netgear are totally unable to comprehend that I don't like that and want a properly working replacement. So we stick with the rubber band fix.
Up here in the rural hideaway, I'm using a DLink modem, a Linksys router, and a DLink Wireless access point. It "just works".
So ... if your mix of bits is annoying you, I'd be inclined to get a Netgear DG834G - everything in one box - and make sure it's working OK, cables connect OK, etc, before junking the old stuff. If it's not OK, send it back for a refund (I wish I had, now, but that would leave me Internetless).