oh dear lord, that's quite a question. look at your closet, are you missing anything that you think about all the time? a fantastic tweed winter jacket? a sturdy black high heel boot? a wear with everything last forever leather work bag? what do you do for a living, are you looking for work clothes?
i would...
$100--really really nice brown/cream tweed pants
$250--two (about $125 each) cashmere sweaters. purply plum color and black.
$150--lots of new bras and panties and throw all the old ones out. ain't no reason to be keeping those nasty ones no more!
hmm...either that or blow it on lots of basics in every color. actually, gosh, i have no clue really.
(give your fiance a big kiss for all us vicarious shoppers!)
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"But I want you to remember, I intend this breast satirically." Susan from Coupling