grasschopper, the link says it'll be a 12-32 cassette. i just switched to an 11-32 on my bike (just to try out something new), and aside from losing all my midrange gearing (had a 13-25), i'm pretty excited about it. took it out for a brief spin to and from work yesterday and it felt great with my 48-38 rings. and some of the same gears that i used to ride in with my old setup felt much easier, like 48-16. would a long-cage RD make a difference? i should probably know this already, but i don't have any experience with long cage vs. short cage...it doesn't seem like it should matter, since they're both doing the same thing...anyway, back on topic...
i have 48-38 rings on my road bike, and the only time i'm wanting more teeth is when i'm going downhill and spinning out and probably shouldn't be trying to go faster anyway. i actually prefer the smaller rings in the front, because i can spin them easier, and i prefer to spin, rather than mash if i can.
in short, a 48T big ring in the front will be quite enough.