buy things that you can use now and when you eventually rebuild the engine.
is there something wrong with your turbo currently? i think dylan has the ct20b for only $500
that'll prob give you the biggest bang for buck in the short term, fit that, also a walbro (or other 255lph+) fuel pump and maybe a haltech sprint ECU.
or just save up for a rebuilt engine with forged pistons and CAMs etc