What is a good Case/PSU combo? I don't require anything fancy, it just needs to hold the stuff and power it.
Is it worth going for 2 560's or should I go for a single 570?
Is there enough of a difference between a 560 and 560 Ti to justify the price difference?
Is there anything here that can be replaced with something cheaper that is close enough to the same performance?
Do not buy a prepackaged case/psu combo for this system. With two video cards, you need a lot of power, prob. a good quality 750W (seasonic or corsair prob. the best brands), not whatever people want to package with their cases. And you probably want a case with really good airflow.
The 2 560's is actually a good amoung faster than a 570... will just chew through a lot more power and generate a lot more heat.
The 560ti is better... but not by such a massive margin (similar performance to an overclocked 560, but obviously a bit cooler/quieter).
ATI 6950 cards are faster/cheaper than the 560's. And scale better in crossfire than SLI 560's.
If you want to save some money, why are you getting a 2500K (more expensive than 2500, and all you can do is overclock easier). If you aren't overclocking, get the regular one, otherwise you should probably get a non stock CPU cooler.
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