I'd recommend Kenda K270s or Shinko 244s for the OP; good mileage, passable on both pavement and off road, and . . . AFFORDABLE! 50/50? They're 50/50! Some say the K270 is squirrely on pavement; haven't experienced that myself, but . . . maybe I don't ride aggressively enough on the slab to encounter the phenomenon.
I have Kenda Trakmaster IIs on a separate set of rims; outstanding off-road, but . . . the front tire washes out with serious consequences on hard surfaces (please don't ask me how I kinow this!). This tread is a full-on DOT knobby; pavement mileage probably isn't that great.
Finally, I have a new set of Continental Trail Attacks awaiting any forthcoming long pavement-heavy riding . . . ideal road tire, good in the wet pavement circumstance, not so much in mud, don't trust it too fully off road, but it may be better than I give it credit for--I've kept close to the pavement with previous Trail Attacks; looks
street-biased to me.
Forced to choose only ONE tread, I'd go for K270/Shinko 244; Dunlop 606s get good reviews, but I have no experience with 'em.
So . . . feed at the tire smorgasbord table where you find the tastes most favorable. Only . . . I don't "get" the Beverly Hillbillies fashion statement, long-range tourers with spare tire casings lashed to their rear rack . . . maybe in Papua, New Guinea, but not within reach of next-day shipping. Maybe that's just ME!