I should be able to help (I just finished building mine )
First, there is a big difference between 6-8 and 12-15 psi (Assuming you're going to run an 18g or comparable sized turbo). For both setups I'd recommend:
Pistons (about 9:1 CR)
A good intercooler
larger injectors (350 or so for 6-8psi, 500cc for 12-15)
A 3" exhaust system (Thermal R&D makes an AWESOME system)
fuel pump (190lph should be fine)
some kind of boost controller (manual = cheap, electronic = sweet)
ARP head studs
Gauges: Temp and Boost
For 12-15 psi, I'd start looking at the following:
Hondata (but AFC would probably be OK)
blockguard or sleeves (MAJOR controversy over the blockguard)
Gauges: Oil and Fuel pressure, EGT
Now I like to build reliably, so if some of this this seems like overkill, it probably is, but it costs a lot less to spend a lot money now than spend a shitload in repairs and rebuilds. When you're done, get it tuned professionally.
A tip: however much you think you'll spend on this, add about 50%. Seriously. Good luck.
Also: Don't bother with an A/F gauge. They're useless.
if your engine in great shape you can run 10-11PSI no problem with a fully stock setup 9PSI is better for everyday driving but you will still have the option to turn up the boost
things on my list would be
Hondata with boost option
and tuning tons of tuning
11PSI wont be a probelm if the engine is running good to start with
then again a crappy turbo setup done halfassed will be lucky to see 7PSI making half the power with out blowing up so just make sure you have a shop that knows how to tune turbo hondas
as for boosting 12 PSI you could do it with some SRP pistons, and Eagle rods.
if you want to make a strong engine you wont have to worry about go with resleeving "block gaurds are not worth the time or money" JE pistons and some nice rods
I push to people to stick with SRP pistons if they can unless they are looking to make very high power since well it really makes your honda suck ass when it comes to being a great car for everyday driving JE pistons
burns oil and makes the engine really loud and so on.... Synthoil has helped a lot on the oil loss but its still there VS my SRPs NEVER losing any oil and sounding soooo smooth