Latest cpus are always at a premium I would wait for the next batch to come out,rumours that the Bartons are due out mid Feb should drop the price for the 333fsb cpus.
Is it an Enermax psu??if so you should be ok.
Temps are a little high but then the earlier Athlons ran hotter anyway.As long as its not causing problems dont worry.
Re overclocking graphics card if you increase very slowly till problems start then cut back.
USB have you got the connecters in the right way??