budget of 8-10k including labour
you can buy new garrett 2860-7's for $2200 or rebuild your stock turbos for half that
prices below are taken from ebay, include delivery, all new, can find cheaper here and there but gives you an idea of prices
arp bolts/studs (head, main) $500
acl race bearings (main, rod, thrust) $250
cometic street pro full gasket set, including head multi layer steel gasket $350
n1 water pump $250
nitto oil pump $1350 or nismo oil pump $1200 (n1 oil pump $400 if you are tight on $$)
jun oil pump collar $200
crank collar $100
cp pistons & eagle rod kit $1250
ati harmonic balancer $600
rb26 idler tensioner set $200
rb26 bosch belt set $100
rb26 anodized pulley kit $200 (greddy for $350)
rb26 anodized adjustable cam gear pulleys $150 (greddy for $350)
thats a minimum of 5k in parts, add in machining, labour costs, and perhaps some head work if budget allows
piston #5 in my rb26 was low in comp (ate ceramic turbo wheel, previous owner) on mine. going through all this right at the moment.