That antec is a good deal and is equvilent to a 850-900 Watt PSU from the other guys because of the way Antec rates it's supplies.
I just rolled the extra cables up and safely tucked them behind the PSU. You cant see them and they are not in the way of any fans or blocking any air flow. As I stated earlier in the thread. Good cable management is the key to using a non-modular PSU.
Edit: The 275 is slightly faster than the 260 but not worth the extra $50 to $70 for about 5-10% performance. You should look into the 4870 since it is the fastest card in it's price range in most games. The best way to determine if you should either buy the 4870 or the 260 is to read benchies on the cards and see which one performs better at the games you play.
Anandtech has excellent reviews on these cards as does Tom's Hardware. Just go to the Video section of the forum for links to these reviews and do a search for those two cards.
Here is a link to some pics I took of the inside of my case so you could see what I am talking about when it comes to cable management.
My System Photos On Windows Live
Notice that there is nothing obstructing the air flow in the case whatsoever and that only the lines I actually need are run to the main body of the case. The rest are safely tucked behind the PSU and are only visible upon real close inspection.