I'd probably go for something like this style wise, fit to your budget and, depending on the job, possible expectations:
http://uk.accessorize.com/view/product/uk_catalog/acc_1,acc_1.9/7893970300
Smart, not too fussy, large enough to keep anything you take with you tidy and easily available and large enough to fit extra things for a check before going in (if you would check hair and/or makeup), small deodorant, any crib notes and space to put anything you are given in while looking businesslike.
I'm saying that from a business interview perspective though so depends on what you are going for really.