Oooh...on a cheap budget eh...
How about a nice SR/Super S spoiler? (I may just know where one is for sale hmm!) 4 alloys with 195,45,15s. Colour code mirrors with a can of spray, nice set of seat covers, leather steering wheel cover, ebay a blue light dash conversion, new stereo, remove and replace your k.nob...Green filter in your airbox, paint your rear window buttons to colour code if its a 3dr, which looks nice.
To make your car last, buy 2 tins of Waxoyl and do the inside and outside of your sills, arches and your cross member, you wont regret it as although we love them, they are rust magnets!