Carbide 500R or one of the cheaper Obsidians like the 550D which is exactly your 150 US dollar budget.
THe 550D is silence optimized and has dual front intake fans(though you may want to replace them with AF120 or Cougar Vortex because they're kinda crappy).
Also don't cheap on a power supply, a TX650 is the LEAST I'd reccomend. CX series are rebranded CWT OEMs and use cruddy components(I used a CX750 and it shrieked and grinded to no end, I got a TX750 and it's been silent ever since)
Corsair 500r is at the top end of my budget at £95 but the 550D at £115 is just out of reach unfortunately.
I must admit i like all the corsair 300r/400r/500r, there simple looking and easy to build with. Though i like to see value over other things so 300r would probably by limit in the corsair series as i really dont see a whole lot of things added to the 400r/500r at least none that i would benefit from. Theres that and the fact that reviews show other cases outperforming on the airflow and some state that the build quality isnt that great.
How does the antec 302 compare to the corsairs ? It only comes with a rear and top fan but supports optional 2 x front and 1 x side. Reviews seem to favour the 302 on build quality but with only 2 fans its not topping the performance charts. I was wondering if adding the extra fans would make it the overall winner of build quality and air flow.
Here in the UK i can get the corsair 300r for £59.99 and the antec 302 is around £70 so the 300r is the best value but either case will need the extra fans adding.
After some serious thought i have decided to go with the antec 302 as its cheap with high build quality and great all round features not to mention the cooling performance. Hopefully its a purchase i wont regret, many seem to favour antec over corsair anyway so im almost certain i've made the right decision. Reviews show it topping the charts with the 2 stock fans so id imagine if i add 2 further fans to the front its going to be immense. The side fan may be a little overkill but its there so i figure i'll put it to use too.
What fans would be recommended for the front and side ?