Maybe a B+ is a nice compromise for you. A B+ is basically a C, however there is no top bunk and they are in general thinner then a C. Most of the nice ones arent box looking like Cs.
You are going to need twin beds. The only other options are either the big crack down the center couch bed that you dont want. Or a super small corner bed type thing like in the Travato. I was shocked one person could fit on those beds when I tried them. And im only 5'8 150. The most comfortable RV bed setup is twin beds. But very few configs have them anymore.
Some models of interest to you....
Coach House 220
- Luxury Motorhomes - Fuel Efficient Downsized Class C (Class B-Plus) RVs - Platinum 220
Coach House 261XL
- Luxury Motorhomes - Fuel Efficient Downsized Class C (Class B-Plus) RVs - Platinum 261XL
Coach House RVs are top quality. Only really bested in areas like interior finish by Leisure Travel and sometimes PW IMO. But their shell is the best there is. One piece fiberglass. Look for used ones, you will find some in that price range.
Winnebago Fuse 23a
- Fuse | Floorplans | Winnebago RVs
New Ford Transit RV. Good floorplan. But diesel. Many like diesel. Personally I prefer gas in my RV. But if you dont mind diesel get a Ford. Vast service network. Sprinters are expensive to fix and hard to fix places that fix them.
Phoenix Cruiser 2100
- Phoenix Cruiser Model 2100
Phoenix Cruiser 2551
- Phoenix Cruiser Model 2551
A good company. They make a quality RV that is well built with a better shell then most. Interior touches have gotten better. You can tell they dont have the interior design teams like some of the others. But the last few years they look nice inside, although a bit more basic looking then some.
- Travato | Floorplans | Winnebago RVs
Im biased against Promaster RVs like the Travato 59k. No RV should have single rear wheels IMO. But thats a choice for you to make. I also believe they really messed up the bathroom. More then enough room back there for a proper dry bath but they had to put in that giant wardrobe and you have to button up a awful curtain to take a shower. In general Winnebago is the best mass RV builder there is. Much better then places like Coachmen. Not quite as good as places like Leisure Travel and Coach House. But really good value for the dollar because of the scale at which they build.
Forest River MB Cruiser 220 and 222
- 2006 Forest River Mb Cruiser 222, san leandro CA - - RVtrader.com
Older model not made anymore. Hard to find van layouts that I find nice with a dry bath and twin bed setup. This is a solid one. Well within your budget.
LTV Free Spirit SS
- Leisure Travel Vans - Free Spirit SS - Overview
Probably out of the price range used. But figured id put it in.
I really only put ones from quality companies. The Forest River is a solid unit, though not the quality of the others. Just hard to find vans that fit what you are looking for. Most have awful small wet baths. As far as overall quality I would rank companies out there like this:
The top three are just insanely priced new. Winnebago being easily the best value for the buck when buying brand new.