Wow, lots of responses. Sorry I left out a couple of things originally:
28 point buy
As Thanee said in post #10, I meant DMG/MM/PHB only, and just mentioned no psionics because it is in some online SRDs and I was trying to
avoid confusion. Guess I failed.
You know, I didn't even think of polymorphing. The polymorph-based builds are very interesting, but so dependent on what critters are in the campaign that I would prefer to avoid them. Also they get into the whole pre-errata/post-errata question. I suppose it's definitely the best way to be a melee monster, though (literally).
KarinsDad/green_slime: my build was actually a human who put two of his level bumps into Dex to get it to 16. His INT is only 17.
DannyAlcatraz: Whirling Blade is a favorite of mine, but I'm trying to do this core only.
Iku Rex: Nice write-up, thanks. I had actually included Enlarge Person in my version, but decided the extra damage wasn't worth the penalty to hit. On the other hand, it does give you nice battlefield control.
Moritheil: Yep, core only, sorry. Persistence may not be core, but Contingency is, so I was using that to put up some of the buffs automatically.
Jeffman: Nice write-up, too. Thanks. But as Moritheil points out, Greater Mirror Image is, I think, in the PHB II. Regardless, most everything else looks good. Excellent suggestion.
jrdeggman: My version did not have a big strength (it's 10). He has a 16 dex and Weapon Finesse (which was the main reason for the spiked chain, actually). The +3 on damage comes from Bull's Strength (14 Str) x 1.5 cause it's a two-handed weapon. I actually forgot to give him a masterwork weapon.
Kerbarin: My version couldn't take Power Attack because of the aforementioned low strength. Good spell suggestions, thanks.
Sgthulka: Good suggestions, thanks.
Wow. Thanks everybody. I'm trying to put together a surprise for my group. I do have several splatbooks and was considering using a Duskblade for this role, but I think if I pick and choose from what's here I can get somebody who will really surprise the group.
All this came out of my realization that there are really two ways to advance a character in D&D: Levels and "everything else" (being feats, skills, etc.). I wondered if it would be possible to make a character who filled two roles fairly well while taking only a single class. I think this proves it is, at least for a "fighter"/mage type.