Forget about all this bullshit...You are just limiting the potentially great people you could meet in your lives with a set random 'rules' and 'standards', be open and let people surprise you.
Failing that, check out her ipod/CD collection as soon as you can...if it's nothing by X Factor promoted bullshit, Take That, Robbie Williams, Micheal Bubblei etc then JUST RUN! Stuff like Beyonce's 'all the single girls' and 'don't ya wish your girlfriend was hot like me' etc are also major red flags in my book.
If all or most of her music collection is music no straight man in his right mind could stand then there's a 99% chance she's a twat...
No wait hear me out...
It's just a theory but when a women has been in one or more proper balanced relationships in her life time there's always evidence of it on her Ipod. If you find stuff like the Stones, Dylan, Tupac, Dre etc then she's probably been sane and level headed enough to have dated a decent bloke or two long enough for him to have introduced her to some REAL music...If the only music on there is boybands and 'girl power' bullshit that no straight man in his right mind could stand, then she's in all probability an emotionally immature pain in the ass. Seriously, I've tested this theory...you can set your watch to it honest!
If it's all Cheryl Cole's solo stuff then she's either never dated a bloke for more than 2 weeks or only dates blokes she can walk all over...either way 'walk on by'...