Personally, I'd be more inclined to go for a Sandforce SSD if I could. 80GB would be about the bottom of what I'd want, but, if you're fine with smaller,
here's a 60GB Sandforce SSD for the same price as the C300.
From what I've read, the 64GB Crucial actually tends to perform pretty poorly, at least compared to it's larger cousins. I mean, all SSDs do better with more room, but the delta between the two tends to be pretty large with Crucial, according to reviews I've read at Anandtech.
If you're willing to shell out ~165,
here is an 80GB Sandforce drive. It also has a $20 rebate, but I don't like rebates.