If you are not using any wider than 90mm, you will not need a bag bellows as the regular wisner bellows are flexable enough to run out of lens coverage before they bind up. Any wider and you will need a bag (not shure about the new XL lenses) I use an anchient super angulon. You will be able to use any lens from 90 to 450mm with the bellows you already have.
I'm sure you'll get a hundred different answers. I have a Schneider 150/5.6 Symmar-S in a Compur #0 shutter. It is a single coated one and it still does very well for color photography and would come in well below your budget. My Symmar-S was one of the later single coated years. There are plenty of multi-coated ones on the market for very reasonable prices too.
There are roughly 30 150mm f5.6 lenses on KEH right now and most would fit your budget. Anything from Schneider, Rodenstock, Fuji or Nikon newer than the early to mid 70s will crank out some great images.
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