Re: roland jp 8000
Well, you can do a lot with the JX even without the PG. The PG is for tactile control only, everything is in the JX. $450 USD is a pretty amazing price considering you wouldn't have to pay shipping and these things were like 3 grand when they first came out in the eighties. PGs are everywhere for $3-$400 US if you decide you even need one and are light so shipping will be minimal.
Work him down to what you can get it for but take it for sure.
Got my JD990 today. Having lots of fun. Menus very simple and editing very easy as opposed to the EX5R which was my lost ROMpler.