There are some really nice Alu frames out there and these days can be just as light and stiff as carbon except a bit more hard wearing. E.g http://engineeredbikes.co.uk/donder/ (although technically Scandium rather than Alu)
Technically still aluminium with a tiny bit of scandium ;) "These alloys contain between 0.1% and 0.5% (by weight) of scandium"
@Jaap started
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There are some really nice Alu frames out there and these days can be just as light and stiff as carbon except a bit more hard wearing.
E.g
http://engineeredbikes.co.uk/donder/
(although technically Scandium rather than Alu)