Onkyo TX-SV828THX
Price ($USD):1000
Audio Inputs:
6ch:1
Phono:1
Digital Coax:0
Digital Optical:0
Video Inputs:
Composite:4
S-Video:4
Component:0
Audio Outputs: Preamp 6 Channel
Amplifier: Power (Main Speakers):90 Watts, Power (Surround Speakers):50 Watts (1KHz @ 8 Ohms)
Amplifier: Power (Stereo): 100 Watts per channel (20Hz - 20KHz at @ Ohms)
THD 0.03%
Frequency Response: 20Hz - 30KHz +/-0.5 db
Weight: 33lbs (15kg)
You could hook up a preamp but the question I have for you is should you? There are not alot of pre/pros will all the bells and whistles on them at this point in time. There are a number of receivers though that have all the new toys on them. IMHO receivers do not make good power amps. And when I say that I do not think its a great idea to hook up a preamp to one and treat it as a power amp.
I am in the middle of researching a new reciever to take the place of my current Yamaha RX-V995. At first I was going to not upgrade but realized that I has hanging on to something that was not going to do what I needed it to do. I could jury rig it but was that what I really wanted to acomplish, and the question is that what you really want to do?
I would highly suggest that you intead purchase a new reciever that has all the new decoding and connections. If you are a fan of Onkyo you could update your Onkyo TX-SV828THX to a Onkyo TX-SR805. And you could always move the Onkyo TX-SV828THX to another room and continue to use it. This IMHO is a win win!
The D/A Converters, Video Switching, Surround Sound Decoding, Amplifier Section, Ect.... with the 805 are going to be superior to your 828. The prices are MSRP from Onkyo's web site, you can buy these cheaper online at Amazon and JR. I hear you can get the 805 for around $680. Now there is some debate if these two actually up-convert to 1080p or just to 720p? But it is supposed to send 1080p as 1080p.
Onkyo TX-SR705 7.1 Receiver MSRP $899
THX ultra2 certified
HDMI V1.3 repeater (3in/1out, 1080p compatible)
HDMI video up-conversion with DCDi technology
Dolby Digital Plus, Dolby TrueHD and DTS-HD decoding
100 w/ch x 7 ch (8ohms 20-20kHz 0.08%)
Amplifier Frequency Response: 5Hz-100kHz
High Instantaneous Current Capability: 36 Amps
HDMI Bandwidth 1080p
HDMI Deep Color Capable (36bit)

Digital Audio IN (OPT/COAX) 3 / 2
Digital Audio OUT (OPT/COAX) 1 / 0
Composite I/O 5 / 1
S-Video I/O 5 / 1
Component Video / Bandwidth 3 / 1 / 50MHz
HDMI I/O 3 / 1
Auto Speaker Calibration W/Mic.

(AudysseY MultEQ XT)
Warranty 2 YEARS
Onkyo TX-SR805 7.1 Receiver MSRP $1099
THX ultra2 certified
HDMI V1.3 repeater (3in/1out, 1080p compatible), w/HDMI video up-conversion
Dolby Digital Plus, Dolby TrueHD and DTS-HD decoding
Top line of Burr-Brown DACs for clean sound
130W/Ch x 7 ch (8ohms 20-20kHz 0.05%)
Continuous 6ohms Rated

Certified 4ohms performance

High Instantaneous Current Capability 60 Amps
Amplifier Frequency Response 5Hz-100kHz
S/N Ratio (LINE IN) 110dB
Dual PUSH-PULL Design

DOLBY Decoder DD Plus, TrueHD
DTS Decoder DTS-HD Master Audio
192K/24 Bit DACs

(Burr Brown)
DSP Type / QTY 32 BIT / 3
Adjustable Crossover 40/50/60/70/80/90/100/120/150/200Hz
AV Sync

Digital Audio IN (OPT/COAX) 3 / 3
Digital Audio OUT (OPT/COAX) 1 / 0
Composite I/O 6 / 1
S-Video I/O 6 / 1
Component Video / Bandwidth 3 / 1 / 100MHz
HDMI I/O 3 / 1
Component Video Upconversion

Analog to HDMI Upconversion

1080i Upscaling no
1080p Upscaling no
Multi-Channel Input 7.1
Surround Pre-Outs 7.1
Powered Zone2

Zone 2 Line Out

Zone 3 Line Out

iPod Ready

(DS-A2x, DS-A2, DS-A1)
XM Radio Ready

SIRIUS Radio Ready

Pre-Pro/Learning Remote

/

Auto Speaker Calibration W/Mic.

(Audyssey MultEQ XT)
Input Name Edit

Warranty 2 YEARS
I would also recomend looking at a Denon AVR-3808ci if your budget permits. Another one to consider if budget permits is the Onkyo TX-NR905. Sorry I did not put all the info but I am trying to keep this responce from gettting out of control.

Some are very happy with the Pioneer Elite receivers as well but I personally will most likely stick with the choices of Denon, Onkyo and Integra. I hope this helps in some way?
But I would suggest to go and check out the following brands for yourself and listen to them.
Denon
Yamaha
Marantz
Onkyo
Integra
Pioneer Elite