In reply to cha1n:
> I was sort of assuming that the size of gear required would get smaller as the grades went up
I suppose that's part of it, unless you pick something like an obvious wide crack. But you're not likely to want to carry a C4 #4, #5 and #6 with you anyway, unless you know you need it.
> I would mostly be trying stuff with a higher tech grade and more gear, at least to begin with!
More gear is good, but the high tech grade might not mean it's a well protected route. Guidebook descriptions usually give you a better idea. Words like 'serious' and phrases like 'gear comes after the crux' should get your attention.