I haven't used mine for a long time poor thing sits in the loft gathering dust.
I have a whanging great Antec aluminium case which had the PSU and hdds at the bottom in a separate compartment for heat reasons which was revolutionary at the time hehe! some tornado ( I think?) Fans that sound like turbos spooling up and a homebrew peltier TEC/watercooled setup lol.
Ahhh the joys of miss-spent youth
I'd be looking at putting a AMD 7750 or 7770 in there (£60-75) , or one of the equivalent new R7 cards, unless you're considering upgrading the CPU at any point, in which case it'd be worth spending a little more.