OK, if you really want 203's, then crc or wiggle are probably going to be your best bet..
Just remeber that bigger brakes will be more prone to being hit on things..

You also need to check the the frame forks are rated to take 203's, as some won't be!

I personally prefer the hopes on my hardtail to my jucies - more progressive, and less "snatchy".. Oh, and in south wales (presume you're going to cwncarn?) you won't even get a 160mm rotor to fade! - the decents are FAR too short!