GDAMania.net's forums have a lot of the answers to any GDA, GF/DM questions.

Regarding controllers, here's a link explaining which ones you can use on pc and/or with your PS2.
http://www.gdamania.net/modules/newbb/viewtopic.php?topic_id=598&forum=16

If you have all the skills, time, and resources to acquire the materials needed to build it yourself, go for it; although it will be definitely more than $50. Probably at least over $100 (including time, effort).

What do you guys use?

i just bought a DMKOC, DM/GF V, and swapmagic on ebay for 45$ shipped.  Look for the good deals

I use a DMKOC, and can S most 80s with it.

Also, note that you want a KOC, not a Topway controller. While they look practically identical, the KOC is WAY better than the Topway.

IF YOU BUY A TOPWAY, YOU WILL REGRET IT. Mine didn't even work.  :roll:

Don't buy the 3rd party drum controllers at all. EVER. Even if they seem like a good value. THEY ARE NOT!

Build a Drummania controller if you can. All of the home controllers I've seen have been tiny and unlike the arcade setup.

The DTXpress series are exact to the arcade... although they're a little more (around $300+).

I think I'll ask for the DMKOC for my birthday, and if i don't get it i'll buy one.