I think Little Mix are more of a guaranteed #1 than Girls Aloud, purely because of the competition with Olly on GA's release date, and I think 'DNA' will probably sell more overall too.

 

Stooshe won't come within sniffing distance of the top 10.

Unfortunately I don't think Stooshe are a contender for this, I think Waterfalls will do better than 'Love Me' but no where near 'Black Heart'. DNA I think will do well, get the #1 and sell consistently. I thought they'd get #1 with Wings but didn't expect first week sales to be as strong as they are and I definitely didn't think they'd still be hanging around the top 30. Girls Aloud will do very well on the hype of their comeback / Children In Need single, I think they'll go #1 too, but I think it'll slide faster.

 

It's nice having lots of girl groups at the moment, I wouldn't mind GA sticking around for a bit (despite not being much of a fan) so that none of them have it easy and get lazy.