I am picking one up right now in Canada. A refurbished CRJ (Indy bird in a former life) with corporate interior and seating for 16. IPOD Docking stations, individual viewing screens, 17" flat screens, 2 "living" areas dividing the cabin with a center pocket door and each one has it's own captain chair, another pocket door seperating the galley from the first living area, 2 very nice lavs, and cabin access to the cargo bay (a great feature). We have the aux tank set up which holds 600 gallons. Cargo bin is about a third of the size and limited to 900lbs. But, in my experience that is enough. Upgrades for the cockpit, we have dual FMS and dual IRS, SELCAL and sattellite phone. About a 3000nm range. It is no global but for the luxury interior and cabin size (the bins are gone of course, think stretch challenger) coupled with the fact that Skyservice in Canada has "zeroed" out the engine and landing gear this bird is a steal.
The airframe is life limited to 100k hours so you could get a steal on a CRJ with 20k hours and still have a lot of years left based on corporate usage. Sounds high but you would never guess ours has that kind of time. Refurbished from the ground up. I would guess mid-teens on the price depending on options. Even our seats up front have been repadded with new sheepskin covers. The over head panel still is a little crusty as is the lower CB panel but other then that you would swear it was new.
Just to echo what someone posted about Part 125. You really want to avoid that at all costs if you can. Real pain in the arse if you ask me.
To give you some numbers for comparison, we are planned to fly KBDL-KBFI in 5.08. Our burn looks like 13200lbs
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Good luck with your search!