don't worry about SATA 3 (600MB/sec) for mechanical harddrives, none can sustain a faster transfer than 145MB anyway which is less than SATA 1, so the extra bandwidth is useful only until you have exhausted the 64MB cache.

The F3 drives are supposed to make awesome system/games/apps drives given the fast response times and speedy transfer.

Shame the Crucial SSD isn't available in Oz as it is thoroughly brilliant, i have the 128GB version. But again SATA 3 doesn't matter that much as the majority of SSD's don't exceed the 300MB/sec of SATA 2. Yes, they are best used as system/boot drives.

An alternative would be a Sandforce based drive as they are both reliable and cheap, in addition to being very fast.

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p.s. the GTX 560 is a very nice card. but if you can stretch to a 6970 i would recommend that (£200 vs £260).