is Belkin a good brand, or should I trash my router and get an ASUS, Linksys, or other brand of router?
Short answer: No. All of the entry level router boxex is a kind of russian rulett. No matter what brand. (Asus, dlink, linksys, tplink, etc) The problem is not on the available software services. There are a lot of times when i wondering what these cheap router can offer. (positively)
The main problem is the quality of the parts, and the low onboard memory etc. That's why these wonders have to restart every x week to working properly.
So there is no good answer, try to get NOT the cheapest of these boxes. As price goes up there is more stable modelas are available.
Anyway if your pc-s can connect with full bandwith without Belkin router, then you replace that. If not try a good linux live cd and check the nearest server on speedtest.net or similar site.
MorphOS PowerBook G4 1,67GHz, 2GB Ram, 250GBHdd, ATI 9700/128MB
Morphos G5 2,7GHz, 8GB Ram, 500GB Hdd, ATi Passive cooled 9800 PRO/128MB