Definately the cobalta flux. it works great with ddr and in the groove. and if you're serious, you can hook it up to stepmania for a much bigger challenge, and it performs flawlessly. It has a much better feel than the afterburner, but the price is really high. So don't buy it if you think you're gonna quit anytime soon.
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GH3 Expert Goals:
600k TWiE [] (DAMMIT 598k)
FC TWiE []
30 Expert FCs [] (20-something)
top 50 overall [] (maybe if i actually put a recent score up)
700k TTFaT [] (620k)
say something so blatantly amazing that someone has to put it in their sig []
Make a goals list [X!!!]