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Buses to Finsbury Park get really busy in the mornings and the train from Harringay/Hornsey is also pretty busy (it may eventually be sorted with new trains/timetables in the imminent future but it can be a struggle to actually get on a train), obviously not that much of an issue if you're cycling.
It still commands a hefty premium compared to Harringay just the other side of the railway line (although that is starting to catch up with organic stores and cafes).
On another note, Crouch End seems less pricey than I would have thought, presumably due to lack of tube / train.