mac or pc as a pvr/dvr

[buckshot]

since this is the only forum i'm a part of can anyone help me out?

i've posted before that i'm ditching cable for an antenna and looking to make a pvr/dvr. as a divine sign that this is what I should be doing I won a new imac in a radio contest. I plan on using it for music recording in my home studio and photo editing. I have a fairly good pc, I upgraded the ram to 1gb and have over 300gb of hard drive. but I have the stock video card etc etc. so would my new imac be better to use as my pvf/dvr, recording and photo computer? or should I just make the pc my pvr/dvr? i'm picking up the mac today so I don't know what the specs on it are yet. but I am picking up a 1 terabyte external memory for all my audo/picture files.