OK, I've located some low-cost power amps that I am interested in but I wanted to know a little bit more about the companies. The amp will be used to drive 4 ohm / 87 dB speakers via a B&K stereo preamp. I was hoping that people could give me their opinions about the following brands:

- Roksan (caspian line)
- Fosgate Audionics (FA500.2)
- Adcom (several models)
- Parasound (several models)
- Exposure (mostly used models found online)
- PS Audio (leaning heavily to the HCA-2)
- B&K (only because of the preamp)
- Rotel (several models)
- Marsh (several models)

Basically, I'm looking to rule out those companies that produce amps that aren't warm and bass-rich (i.e I don't want a bright, thin sounding amp). Also since I will most likely be buying used, if I should avoid any of these companies because of bad quality control, service, inconsistent product lines or if there are models or time periods I should avoid, please let me know.

The only amps I have heard in my home are Parasound, Rotel, Adcom, but only a few models, and never side-by-side, so I don't want to make a decision based on that. Also, I am borrowing a PS Audio HCA-2 from a friend in a couple of weeks and will be comparing it to that amp (unless I decide to buy it from him).