mate you will have to wait until you are up to that stage of the build.
theres no point trying to guess it or you will waste your money guaranteed!!
just keep the new chain in the bag and concentrate on getting the next crucial part you will need.
also make sure you ask lots of questions BEFORE you buy stuff so you dont end up throwing money away on stuff that i'snt suitable and wont fit.
do ya wanna buy a red anodized bashplate by any chance??.....lol