A lot of people here like the 250's cause they are 250's, only Steve and Matt (I think) have ridden any modded 300 (and he's got the F3 to compare it with). A well sorted std 300 is quicker than almost 250 but doen't have the top end whiz.

Maxim has a modded 300 on the way and a proposed showdown with Steve's F3.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread