Unfortunately mate you can't have it all for that sort of budget...
At that budget I'd say you've got 2 choices..
1: hottuning coilovers.. you can get nice and low, handling will be improved over standard, ride will be harsh though
2: cheap-ish lowering springs and ARB bushes: something like Apex will be about £100 and are decent quality lowering springs.. only going to lower about 30-40mm though, then with the poly ARB bushes you'll get the improved handling..
the 2nd option is based on your shocks not being totally f*cked though!
Quality suspension is big business and as such has big price tags for the best stuff
Having followed a few of your threads now I'd say personally just for now get some lowering springs and the LM reps with tyres and you'll be a lot happier with the car.. it'll look a million times better and handling a little better..
then if you want to, save some cash and get your poly bushes and uprated shocks or coilovers