Welcome to Talkbass!
That's a nice price bracket to be in, Mullet!

If you're after the 70's sound, you're probably gonna want to get 70's pickup spacing and both of the basses you mentioned have 60's spacing. I know that you can request 70's spacing on an Ultra-Vintage NYC Sadowsky but I have yet to see a 5-string ordered like that. Obviously their Metro UV70 model is already pre-configured that way but some people just
have to have an NYC!
I don't think you can order a USA JO 5 with 70's spacing. I haven't played one so I can't really comment on it.
In addition to the 70's pickup spacing, most people would consider the ash/maple wood combination to be a critical part of the 70's tone equation. If I was looking for a dead-on replication of the Marcus-type 70's tone in a 5-er, I'd get a Sadowsky UV70-MB-ASH-5 with the single coils. Lots of people rave about them single coils. I have an MV5 (ash/maple, 60's spacing, HC pups) and it gets real close but it doesn't bite your head off. Besides, if you get a Metro you can spend your remainder on Hammer pants and hypercolor tanktops! Or not.
Just out of curiosity regarding your altered tuning, do you tune up or down to your pitches?
Good luck finding a new bass!