ah! sorry about that i thought you had enough to make a choice... as you mentioned the K90 as being an option. and the average price of 99.99 with delivery. although it can be had for about £15 cheaper if you shop about.
wile scan an others have the rapid in for under 70
http://www.scan.co.uk/products/coolermaster-cm-storm-quickfire-rapid-mechanical-cherry-red-mx-gaming-keyboard?utm_source=google+shopping&utm_medium=google+shopping
http://www.scan.co.uk/products/coolermaster-storm-quickfire-pro-mechanical-gaming-keyboard-with-partial-red-led-backlight-on
the trigger is a nice option but for the difference in price i wouldnt say its better. due to the fact it doesnt have nkrol (all key anti ghost) only 6krol it costs more because its fully backlit. it does have full backlighting but thats less important than actual key function although 6 krol is perfectly fine if you dont play teken or other kinds of games that require more than six key presses... there aint many so 6 is often enough.
i would highly recommend the rapid and pro though and you can order which key type you want between red/black and brown. blue doesnt seem to be an option as they are already pretty clicky anyway no matter what version you get.(reason for this is coming from dome and plunger keyboards we tend to bottom out the keys and it takes an age b4 we adjust if at all.
so mechanicals clack rather than have the click clack of the blue keys which has an added click)