You may want to google Phillipe Heller. I found him to be honest and a great inspector. He has uses up to date technology including infra-red to supplement standard moisture detection prong testing. You should be in the 400-450 range for the home size you mentioned. Other supplements you may want for additional inspections could be hiring a plumber to scope the drains/mainline. Hiring an HVAC guy to thoroughly hit the HVAC, (you can ask the seller to call SDGA to do a CO2 test on the furnace for free) and even a hygenist to take spore samples for mold. Generally those additional supplements are over the top but each buyer has a different threshold for inspecting things.
