This is a nice article discussing and showing all of the conventional Cherry switches...
http://www.keyboardco.com/blog/index.php/2012/12/an-introduction-to-cherry-mx-mechanical-switches/
If your looking for a board that feels similar to your current one then reds should be quite natural, well suited to gaming but most consider browns or blues best for typing. Personally I have a K70 with reds that I use all of the time. Blacks on my work keyboard, greens on my 60% and I just ordered another Filco with blues so pretty close to a whole set. Right now reds would be my go to even for typing, I don't get on with blacks that great at all, greens are different and really novel to use but not for extended periods. Maybe I will eventually prefer blues but anyway its all down to preference and style. If you've been used to the relatively long travel membrane switches in a K30 then I think reds you will immediately get along with.
Corsair also have new MX-Silent switches available in their Strafe which is a bit of an unknown quantity to me at least.
Finding a reputable and respected RGB backlit board at £100 might not be possible the K70 RGB, Strafe RGB and Ducky Shine 5 RGB are all closer to £150.
This really isn't a bad deal right now -
K70 RGB at Currys/PCworld £119.99
One reason to consider the Ducky might be that unlike Corsair it uses standard size ISO (UK) or ASCII (US) key caps making it easier to modify and customize. US layout particularly is much easier and cheaper to get keysets for.
Also if your open to consider TKL (80%) keyboards there are a few more options too, like the K65 RGB.
JR
