Adcom Vs Rotel

As what others have pointed out, you need more than a Rotel or Adcom to show what those BW can do.
Even the entry level B&Ws are awesome with higher end amp/pre-amp combos.

The Adcom amp is actually very good. I can't comment on the Rotel but they are/were imported by the same company and are usually sold by the same stores and paired with each other. A high current amp is a necessity with B&W though.

If I were in your situation (i.e.: couldn't afford what I really wanted or what any of the above posters suggested) I would probably keep my eye on a budget line like you mentioned. Rotel, Adcom, NAD, Parasound, etc. I would take my time and do my homework, then buy used so I could resell fairly easily if it didn't work out. Narrowing down between 2 or 3 componenets as opposed to 2 companies as Stanwal suggested will help as well.
Take your time. You'll find something to hold you over and give you good, if not great just yet, sound.

I would put Classe on your list. I have paired a variety of Classe electronic components with my B&W 802 Matrix Series 3 speakers to my delight.

I have found in the past, that when I settle on an amp that is not the one I want, as soon as I buy it, the one I want pops up for sale at a real bargain!
My luck.
Take your time, research, wait on the right one, and you will be happier than buying one for now that doesn't make you as happy.