Have you thought about the Yamaha option? I know they aren�t truly aluminium, but they are top loading, compact and watertight. I know some people have moaned about the keys/locks, but I�ve never had any bother (4 years/25K miles). You should easily be able to get a good second hand set well within your budget (in fact I believe uberthumper has a set for sale at the moment?)

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