What Chain? + Other buying help!

I've had my GT Avalanche for about a week now and I've basically spent today taking the bike apart and cleaning it like a lunatic. The chain, however, is pretty rusty and needs to be replaced (bike is 8 months old, bought second hand). So what chain to get for a 27 speed bike? My budget is less than £50 as long as the chain is worth it.
Also, thinking of draining the bike and need to know what mineral oil I should use to replace the drained stuff, any ideas?
Finally what brushes should I buy to be able to thoroughly and easily clean the bike?
Thanks.
Also, thinking of draining the bike and need to know what mineral oil I should use to replace the drained stuff, any ideas?
Finally what brushes should I buy to be able to thoroughly and easily clean the bike?
Thanks.
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what?
Parktools :?:SheldonBrown
Oh and brushes what ever you want. I use a few from Park.
Parktools :?:SheldonBrown
Deda Acciaio
Pro6
Cotic Soul
Merida
Austria 2012
2008 Specialized Stumpjumper FSR Comp for playing in the mud.
2013 Trek 1.2
1982 Holdsworth Elan.
1987 Peugeot Tour 10