nice upgrade

sounds like a good choice
performance wise dont expect massive gains without spending alot of money without supercharging or turbo'ing it you will need to spend 4k+ to reach 200bhp simple mods to get it better a good stainless system a enclosed filter with cold air feed and a good service will see you around the 155bhp -160bhp can go extra lightened fly wheel ported polished head matching inlet etc etc dont expect massive gains

you dont really need massive power to have fun in it mine was rolling roaded at 154.7 bhp few weeks ago at carbon chiptuning rr day and tbh it keeps up with a few more modern cars including a stock 1.8t mk4
You can go as low as coilovers will let you tbh on 15" 195/45 tyres im at about 90mm front 80mm back i think

17" need winding up abit with brand new tyres as i just found

not sure about arb probs mk4's have but just make sure your cv boots are in good order and might be worth renewing the drop links and tierod ends and also ball joints for peace of mine also poly bush everything as mine is makes it much more exciting

I reckon you paid 1150 depending on service history etc and yes you've made the perfect decision ever need any help give me a shout and i will try and direct