I have LR4/CS6, I do ~95% of my work in LR4 BUT if I had to chose 1 product it would be CS6. The only thing I'd be giving up would be excellent LR catalog management which I could probably get elsewhere or make due with Bridge. Other than catalog management, CS6 can do everything LR can do and many things it can't.
Wow, that's an expensive 5%. Just saying
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EDIT: I'm not a professional, so I use LR4 about 95% of the time, and Perfect Photo Suite 7 for layers, masks, special effects, and resizing. It is a very powerful tool, and much cheaper than CS6. I can see pros wanted CS6, but for me as an "enthusiast and/or advance amateur," Perfect Photo Suite works for me and my budget.
u can find progs around to ''try'' 
