monitor hd on a WEAK bdget

so many questions... stepping into hd very slowly... water is cold for now... proud owner of a kona lhe with b/o box... now since i have switch to the hvx 200 and the firestore i know the lhe is not necessarily needed for capture but to monitor from my fcp timeline... this is inhouse stuff

if i strictly use the apple cinema display for monitoring is this taxing the system in a big way?

is there a decent monitor out there that i could run the component, out of the lhe, to... and have some reasonable picture to work with? (will be using 720p for now, 1080i in the future)

any suggestions or links would be most appreciated