Crack in aluminium frame near dropouts

Shiiiat.

Yeah I saw the crack and rode home in fear, steel or carbon from now on I think, had two aluminum bikes crack on me.

Ach well, at least I won't be riding a Langster any more...

You may want to think this through more carefully.

Carbon can be easily stiffer than aluminium, and therefore though potentially stronger, it is even more expensive/difficult to repair should a crack develop. In fact there are a million images around of that famous BMC track bike, suffering a crack during a competitive track race.

I've cracked a couple of aluminium bikes too, and I will buy steel in the future. But I won't assume any similarities in the reasons for our frames cracking, so I can't suggest what is best for you.