I think DPI sells the cams for just under $700 with a core charge. It's no longer listed on their website, so you have to contact him directly.
Spec 1 exhaust is just under $2k, and the cat forward exhaust is just under $800.
http://www.deloreanindustries.com/spec-i-exhaust/
http://www.deloreanindustries.com/sp...tem-stainless/
If you're planning a performance exhaust in the future, I'd do cams while the heads are out, even if you don't realize their benefit immediately. When you do install the exhaust, you'll then get the benefit of the cams, too.