I'm assuming you're talking about the Cannondale Jekyll and you just butchered the name.
I dunno, FS never did much for me, I'm more of a hardtail kind of guy. It's no Scalpel, but its a good bike, no doubt. You should know, you own one
Whether or not you want to go singlespeed is up to you. I'll leave it to the more opinionated people to chime in on pros and cons, but it sounds like you already have a good argument for going SS - not having all that junk rattling around. Just run a high-quality tensioner and be done with it.