Uuhh.. Just go to http://www.emulator-zone.com and look for the highest rated emulator for each console.
Site only deals in emulators, but no roms or bios so it's legit. Been up for forever too.
I was doing so well resisting buying anything, but then I saw this http://forum.kerbalspaceprogram.com/showthread.php/39569-KAS-Crossbow-Constant-escalation-of-insanity
and I just had to have Kerbal Space Program.
Then my friend wanted to play Castle Crashers so we bought that, and later I...
I managed to purchase Zen on the wrong damn account, wonder if they do refunds or transfer them to the right account? I opened a ticket but they're so busy they haven't gotten back to me yet.