Based on your priorities list, I'd say Human, Iksar, or Dark Elves are your best bet.
I personally like Iksar SKs, as they have some interesting history and Greenmist (which won't be available on P99 by the sounds of it) is amazing. On live, they end up with the one bonus no other race can get via AAs - bonus AC.
Human are also interesting in that they're one of the few SKs that can get around without being absolutely KoS to everyone and everything. And being a Plague Knight (Bertoxx) is cool from a RP perspective too. Humans also look decent with Velious plate graphics, and have access to some good plate stuff that Iksar can't get (i.e. hero bracers, blood ember, etc.). Slightly less XP penalty both now, and after the penalties are removed (as racial penalty still applies).
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