Monk, Pal, SK, Ranger, Bard - all decent solo/group options when twinking. Just get decent weapon(s), haste item, and HP items and you'll breeze through the first many levels no fungi needed.
Warrior, Rogue - good group options when twinking, pretty sucky at soloing if that's important to you.
Necro, Wizard, Magician, Enchanter, Shaman, Cleric - gear makes little difference. So you could play one of these and roll the 15k into them. If you want an excuse to spend 15k for this next character, it would be mostly wasteful to blow that money on any of these classes. Grab a few +HP items and you are golden with any of these classes.
Consider getting ALL/ALL gear in case you don't like your alt and want to switch, you can just hand the gear to the next class you try.
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