I love Manolo's (my first designer obsession) because they fit like no other.
Manolo is great at tweaking classic styles to make them a bit more modern and fun without being flashy, unlike our beloved Louboutin in this forum, who is about being noticed. Nobody does d'orsays like Manolo, so I would suggest a pair or d'orsays. The Sedarby's are a fave since they are just the perfect d'orsays, imo. But they are definitely a special occasion shoe in most of the incarnations. If you're going for something you can dress up as well as dress down, so you can get the most mileage out of them, I would suggest these:
They are classic in shape but the thicker strap and buckle and higher-cut vamp makes them modern. The patent adds fun, and the heel is a manageable heel so you don't have to exclude them on fun nights out because of lack of chauffeur, but still sexy. These shoes are at once classic and will be around for ages but also young enough to pair with jeans and a fun top. I think you'd get alot of mileage and bang for your buck int his shoe because there's not a single thing I can't think of wearing that these wouldn't be great with (well, barring sweats, of course) -- a-line skirts, pencil skirts, dresses, jeans, dress suit, etc.
Oh, and congrats on a first pair -- it's def very exciting!