PSU: That 750 from XFX is definitely plenty with a ton of leg room if you wish to add much more power hungry cards in the future and OC your 2500k.
I do not see a heatsink i highly recomend one if you plan to OC that 2500k, a Hyper 212 EVO is a very good budget cooler. THe havik 140 also fits in your case and would be a really wonderful adition to your rig, giving you plenty of cooling for pushing your 2500k.If you do decide to get a aftermarket cooler, get the low profile Vengeance kit , makes clearence issues dissapear.
If you plan to get a 64gb ssd i highly recomend you get a small hard drive to go with it for your games and files, a large portion of your ssd will be gone with just the windows install alone. Add a few newer games that can be over 7+gigs and you will quickly run out of room.
That 660Ti is a proper nice card, can you post what prices your parts cost? Maybe we can help you find better deals.