Auction style drafts are very entertaining. Player prices can be found in a lot of places. Try this website http://www.fantasyauctioneer.com
for average auction prices and you can participate in free auction drafts. I like using $100 for the cap, just because it is easy to keep track of. The only problem is if you use a website like yahoo is that it gets confusing trying to keep track of the prices and cap room after trades and F/A pick ups. I am in a pay league and myfantasyleague.com works great for it.
I hope you enjoy the new format.