video scaler/doubler question

I know very little about video and have what may be a really dumb question. We recently bought a bought a Samsung 42" rear projector tv. I was wondering if there is anything I can use to enhance the video quality on standard Directv signals. The tv does not have a VGA input and I was also wondering if buying something like a DVDO and then a cable that converts VGA to component video would work. Would the VGA to component video cable kinda cancel out everything that a scaler/doubler might do??
Zspradlin, I doubt if any scaler will help. I have a 50" panasonic plasma and bought ad dvdo hd+ hoping it would improve the standard digital directtv broadcast. If I sent the signal out of the samsung satellite receiver in "native" and let the dvdo do the processing the picture is worse than simply utilizing the Samsung. On dvd's I notice no improvement letting the dvdo do the converting rather than my Pioneer Elite. The only benefit the dvdo provides me, albeit an expensive one, is to eliminate the black bars on top & bottom of most dvd's and left & right on digital ota channels. The picture can be "sized." This eliminates any possible burn in on the plasma as the black bars are gone. Hope this helps.
Specifically what element of "video quality" do you want to improve? How old is the TV? Non-HDTV, I assume.
I have a Lumagen HDP and it made my Cox cable over component cables tolerable and really cleaned up the noise in the picture. when you have a 103" DLP projector you noise bad content. Make sure to upgrade your cables (DVI or Component) My Wireworld DVI cables stopped the ghosting and my MIT Component Cables really helped. Monster and generic cables ghosted and sucked the contrast out of my system.

Don't bother doing VGA to component conversion, use the component output on the Direct TV to a scaler and then component to your TV. Pickup AVIA DVD to tune up your TV before all this. I believe DVDO offers a money back period, Lumagen allowed me to upconvert analog inputs to DVI output for the next generation.