You can do a turbo buildup VERY cheap if you want...but not to offend anyone, but the saying holds true, you get what you pay for.
Like me, I bought basically the best of the best, when it cams to parts like the boost controler/wastegates/BOV/intercooler/vac&boost line/V band clamps/silicon couplers/T bolt clamps/fuel gauge/fuel pump/injectors/MAF/ect .
Only parts I went cheap were the turbos LOL....and its because they were so cheap is why i am even doing this. BUT if they crap on me later on, I can just buy some slightly (maybe) bigger ones direct from garret or something, and they will bolt right up.
I have spent $5000 in my entire setup...but thats JUST parts. That doesnt include the MIG welder, its argon gas, wire for it, tools needed to do the work, griding wheels that we ate up, labor, ect. There are ALOT of hidden costs you know...but fortunatly my dad bought the mig, as he has been wanting one....and like all of the little grinding pads.
BUT im going to pay him back for like everything anyways, and all of the stuff he has bought for both cars over the past few years.