Replying to HELP! XBOX 360!

Alright so I'm thinking of getting an Xbox 360, here's the problem: Do I get an Elite or Pro?

Based on an EnGadget review they are almost identical (in terms of heat, noise, graphics, etc) and the only differences are very subtle. From Wikipedia I can gather the only tech differences are a 120gb hard drive (Elite) vs. 20gb (pro).  The Elite also comes with a Separate TOSLINK and RCA out cable (I have no idea what this does or means, halp?). 

So my question is: is it worth spending extra money on an Elite? The only huge difference I've heard of so far is the hard drive obviously. But is 20gb enough for saved games, patches (I'm assuming some games add new content and fix bugs) and the occasional movie or photo?

My biggest concern is probably the hard drive difference. Thanks in advance for the help.