There've been about a bazillion threads on regulators on this board, so a little searching should turn up quite a bit of good (and not so good ) opinions.
In general though, Scuba Pro makes a fine product. I've got a Mk 20/S250, and I dived it in fresh water and salt water, temps down to 33F with no problems.
But of course, Apeks is also good (maybe even better under extreme conditions), Sherwood products haven't killed anyone lately, on and on.
Key considerations should be how the 2nd stage fits in your mouth (I didn't find the Sherwoods all the comfy for me), and what brands your LDS handles. You want to be able to get service if and when you need it.
Rotsa Ruck.