Well, you're right about the heads.. my bad
Bugpack tends to be more expensive than scat in most cases, don't know why thoug. I mentioned I was considering the volkstroker kit but I'm not a fan of buying kits now, ever since i discovered serrano's. There I can buy whatever parts i want for the price of a Kit. Maybe he even sells kits, but i haven't asked.
It's a store that sells parts via thesamba.com classifieds. They sell good quality parts at extremely low prices. However, the main advantage from aircooled.net is the excellent support that John Conolly offers, from what i've read.
Check this link, it's a search on thesamba that shows serrano's articles.
HERE