Skirmish would work for any attack if you move 10 feet that round.
I wouldn't recommend Cleric, as one level would add almost nothing. d8 hit die is nice, but the armor is useless, the spells are ok but nothing you can't live without, and you wouldn't get any extra skill points.
I'm a fan of anything that gives you more skill points at level one. A recommendation I would make is Spellthief, from Complete Adventurer. Later, once you can cast 2nd level Wizard spells, grab Master Spellthief, from Complete Scoundrel. Not only do you get a nice skill point boost, but you'd then be able to cast spells in light armor, and any time you sneak attack a spellcaster, you can steal a spell from them instead. Combine this with Greater Invisibility (so, don't have illusions as a barred school), and you can sneak attack whenever, dealing extra damage against folks who don't cast spells and stealing spells from those who do. Note that this does use a feat designed to combine two classes in a gestalt build, so you may need to run it by your DM first.