This thread is quite relevant to me as its pretty much the figure I had in mind when I started to mod my car, all in, including a brand new hybrid turbo doing everything myself I've spent just over 2500 quid.
wee bit of a cost breakdown
turbo-700
rods-400 shells-70
xspower mani,dp an sports cat 450
custom rtech map-390
new dmf clutch etc- 500
parts gaskets bolts oil etc- 100
The above is just a general idea of what I've spent, obviously mods such as suspension and other things are needed to fully utilise te engine mods but should give some idea of what's involved. Labour if not done DIY will contribute a heffty amount on top of the above.
Even with all that I'm still fitting wmi to gain that wee bit more power lol