upgrading the turbo?

[Amadeous]

i heard the 14b is a good one also.. should i go 14b or 16g?

right now honestly i have a
-boost gauge
-new fuel filter
-new valve cover gasket... not a lot..
before i do any turbo upgrades though im going to
-pressure test the air system
-replace the head gasket and oil pan gasket (already have)
-and get a new exhaust manifold and gasket
make sure that everything engine wise is good then im going to slowly get everything else. i just wanted to know what route i should take.
im not looking to get to much into the engine.. mostly bolt ons.. i want to reach around 300whp to maybe 350whp if i can.