I like the layout in the Regent more than the G50, however its probably been 13 years since I have personally seen or sat in either. $6500 is probably a good price, but I haven't seen recent Saratoga pricing to confirm.
The Marquis V94L is a really nice layout and at $7900 that is a good price. Just remember that the Vector21 series, everything is an upgrade. Full Foam Insulation, Spa Frog, Ozone, Starlight LED Lighting, etc. I would expect it to have none of those at that price.