I had an Alpha 9 (upgraded from an 8) which I enjoyed very much. I haven't heard the new DiVas, but I have heard the FMJ CD23 and the Sony mentioned above.
The 9 or the FMJ are a BIG step up from the 7SE, which is a very nice budget player. However, the 9 and FMJ are true high end players, with greater depth/width of soundstage, detail, dynamics, frequency extension and refinement. They are much better at sorting out large-scale, complex music than the Alpha 7. (BTW, I too much preferred the 8 AND the 9/FMJ to comparable Rotels.)
Contrary to the above post, I would not charactarize the sound of these players as laid back. While not forward or "in-yer-face", the Arcams were quite dynamic and rhythmic. I spin a wide variety of discs, classical, jazz, rock, world, and the Arcams did well on all types of music. If you like your Alpha 7, there is a definite family resemblence, a house sound. My sytem when I had the Alpha 9 was pretty revealing, with a combination tube preamp/ss amp and Nordost cabling.
Certain criticisms of the Alpha series - lightweight chassis and some clocking issues - seem to have been addressed in the DiVa 92, so I would definitely audition a 92 if I were looking to buy new. The comments here and at Audio Asylum have been very favorable on the DiVas.
The Sony player, which sounds wonderful on SACD, is not as good on Redbook CDs as any of the Arcams you are considering.