My $.02 worth.

I have been impressed with the Harmon Kardon products - especially the seven channel surround and the capability to tailor. Plenty of power.

If you like the looks of the JBLs (or don't care) you will not IMHO need a seperate sub (overkill?). Then the rest of the budget is for the four wall mounts. See opinions (above). I would say audtion a few and see what 'style' of speaker you like (horn/hard/soft tweeter, etc).

The Bose may (dare i say it) actually do well as surround speakers. So. In your case - i would say big money reciever first - then see if the speakers need upgrade.