if not I could get what I have already again but even with this should I get another GPU thats better for lack of price or maybe 2 separate ones thats cheaper with better performance (in other words is there another set I should get that would be better performance and cheaper).
No, that wouldn't work. For sli, you can only use the same card, preferably the same model. This is kinda hard to do. So the 560ti is probably 15-20%. So if it is, then the 560se sli is probably about 570-580 performance. If you could sell your first one, you could get a 7870 which is about 7% stronger than the 580.
I have he's things on radeon cards and their reliability though, also some on nvidia of course, I am sure it's nothing major and won't really affect my performance but I would like to get your word on it.