First off, don't waste your money on a slide fire stock. If you know what you're doing you can easily modify a Tapco stock and make your own for about $70.
http://www.youtube.com/watch?v=RIcYVOJqWgk
As for the rail, I would say that a Titan is the absolute best you can buy. If you don't feel like spending that, get a regular hand guard. Any other quad rail looks bad in my opinion. If you like the looks of it, then you should buy whatever you want.
http://www.gunsnet.net/showthread.php?16689-DIY-Homemade-Slide-Fire-%28bumpfire%29-stock-for-AK-47