Earphones / Headphones: Where to try, what to buy?

so, a week with my AKGs and already I'm contemplating my next step up for home listening. Im thinking Grados, based on all the superbly positive reviews.

Bare in mind that at the moment the best I have in terms of input are flac files fed from either my powerbook or iphone.

Between the sr60i and sr80i there is about £12 quid, am I right in thinking the upgrade is a nobrainer?

Any other suggested rivals at the 100 quid price point?

I'd suggest you definitely try some (any) Grados before you hand over any cash. They aren't for everyone, a lot of people find them treble-excessive.