after much deliberation on which model of mk2 golf to go for i have finally chosen an 89 reg 8valve!

i am new to the vw scene after previuosly owning a fiat coupe turbo and i am desperatley in need of some help!
for reasnoble money what is he best modification i can do to my golf to give it more power?
your help, knowledge and expertise would be much appreciated!
