The top end Silverstone is the TJ11, it's a massive watercooling behemoth.
The TJ07 was the predecessor of the TJ11.
The FT02 is a combination of the TJ07 and the original Raven. It's the air cooling god of cases, however more and more people are fitting it with a 180 rad. (Magicool 540 slim rad if you were looking into it)
The Raven (RV03), is thinking about it, one of Silverstone's cheapest cases. However in terms of air cooling, it's one of the best around. For £100 it's the absolute best case in the price bracket in my opinion.
You might not actually need to spend as much as your budget suggests to get a solid case. To be honest, no matter what the budget, above £150 I'd probably be considering a few cases (I'll cap it at the top of your price range):
BitFenix Shinobi XL (reviews to come, but looks like it will be promising)
Xigmatek Elysium
NZXT Switch 810
Silverstone FT02
Corsair 800d
Silverstone TJ07
The TJ07 has some great potential to be modded. Personally I feel it's now a slightly outdated case, and it does need some modding to get it to be one of the best cases around, but if you're willing to do this it can be absolutely amazing.
http://forums.overclockers.co.uk/showthread.php?t=18046633 is a good example of what can be done. One of the first and greatest examples of what can be done with the TJ07 can be found here:
http://www.million-dollar-pc.com/systems-2008/murderbox/murderbox.htm
As said, it has great potential, but probably needs a couple of tweaks to maximise this potential.
kd