If you're still looking, I've got mostly-positive things to say about the Perfect Shot. It feels comfortable, it leaves your second hand free, and it's worked just fine for me over the course of a half-dozen light gun games. Plus, it's one of the cheapest options around ($15 on average, sometimes as low as $10). The downsides are that the orange plastic on one of them broke after a fairly-minor impact, and I'm always concerned about its durability when shaking the remote (as required in Overkill).