Ideal Complete System for $5000

If the 803S is what your really want, then I'd suggest you build a system 2.1 for now around a pair of used B&W 805S which you could use as surrounds later when you move to a 803 based 5.1 system. That should leave you with about $3000 for a sub, stands and a good receiver.

Paradigm Special Edition 5.1 system: $3194.00 (Retail price)
Denon AVR-4310CI: $1209.98 (Internet price)
Oppo BDP-83: $499.00 (Manufacturer direct price)

I have heard and seen this system and thought it punched way above its weight. Guaranteed to please.

If you don't need the BDP, you save $500 - spend it on some decent budget wires, shipping and sales tax if necessary.

My personal suggestion would be for a speaker system from Epos or Silverline Audio. A pair of Silverline Preludes up front ($1200), a pair of Minuets for surrounds ($600) and either a Minuet ($300) or Silverline's LCR center ($600). An Outlaw Audio LFM-1 EX subwoofer ($650) for a sub. An Epos system would include the M16i towers ($2000), ELS3 center ($350) and ELS8 monitor for surrounds ($500), running you about $500 more than the Silverlines. I would go for separates with the $3K you have left: Emotiva Audio has a $700 pre/pro with all the new audio formats, and a 5 channel amp, rated at 200 watts per channel, for $800 (!). The Silverline option would leave you some money for a BD player (the Oppo is a great idea, and is upgradable in the future), cabling and a decent power filter/surge suppressor (I like the PS Audio Quintet, usually priced at $350). IMHO, either system would be as good, although different, than the B&W/Rotel/Velodyne system you mentioned.