aluminium head questions

Ok, lets assume for now that the angled plugs wont work on my car. What's the best straight plug head? The only ones that I know of are the 440Source and Mopar Performance heads. I've heard mixed reviews on the Steath heads. My understanding about the Mopar heads is that they're copies of the Edelbrocks but w/ straight plugs. So, are the MP heads my best option if I need straight plugs? Are they open chamber (I know they're 84cc)? Can I expect to gain 50 HP w/ them? I'd like to get the CR up to 10.5 or so but that would take a 78cc or less chamber.

Any thoghts? Any feedback on the MP's?