you probably have dow33 lube from your other guns, i'd recommend you pick up some dow55. You're already used to LED boards, but the YAK OLED board is always a nice upgrade, but not needed.
4c eyes help in semi, but if you're playing PSP they aren't really "needed".
Yes, on the the pressure tester; it'll make tuning or fixing any problems easier.
Vices shoot great. Thats about it.