I'm helping a friend with her first 5.1 setup. She lives in an apartment so the space is fairly small and blow you away sound levels and bass probably isn't a plus

It will be mainly used for Xbox gaming, DVDs, and Netflix streaming (stereo). She's also pretty into music so I wouldn't be surprised if she starts using it for that too with her Ipod.
Budget is around $500.
I'm planing on selling her my Yamaha RX-V1400 for $150 (maybe dropping that to $100 to get her better speakers). Does this sounds about right? I tried to price it on Ebay.
So that leaves $350 - $400 for speakers. I understand the closeout Energy speakers seems to be the best deal right now and had her set on the C-50 set from audio advisor posted a few pages ago but now they're sold out. Here's other sets I've pieced together form various sites.
1)
Energy C-50 $100 x2 = $200
Energy C-C50 $80
Energy ESW-9 $100
total $380
http://www.wwstereo.com/#/ecommerce/...TV/10/144501//http://www.wwstereo.com/#/ecommerce/...TV/10/144378//http://www.audioadvisor.com/prodinfo.asp?number=ENESW8
2)
Energy C-100 119 x2 = $238
Energy C-C100 $114
Energy ESW-9 $100
total $452
http://www.vanns.com/shop/servlet/it...38/energy-c100http://www.buy.com/prod/Energy-C-C10...210807863.htmlhttp://www.audioadvisor.com/prodinfo.asp?number=ENESW8
3)
WWStereo set
Energy C-300 (2)
Energy C-50 (2)
Energy C-C50
total $400
http://www.wwstereo.com/#/ecommerce/..._84__0_0_0_-1/
Now that the C-50 set is more expensive than it was a few days ago, it seems like the C-100's might be a better bargain. Are the 100's worth the extra $75?
Also the last set doesn't include a sub to keep costs down. Is she going to be missing a lot going with a 5.0 setup rather than 5.1? Keep in mind she's in an apartment. I'm not sure she would add a sub later if she went with the 3rd option.
Any suggestions? better prices? should I be looking at any other brands?