As already said, two hander for now is the best bet (with Windfury on it of course). BUT, you're going to find yourself a bit frustrated in the mid 30's as your dps and killing speed seems to drop a bit. Don't get too bummed or pissed off about it cuz at lvl 40-41 (as also mentioned) you get dual wield and stormstrike.
When you hit this point, 'semi-frustrating enhancement shammy' is going to turn into 'HOLY S&^# I'm an unstoppable killing machine where's the next mob I'm gonna take on all 6 at once while filing my nails shammy'!
Also dig about for some good builds. As tempting as it seems, the Shield Specialization skill is pretty much of minimal benefit compared to other areas of point investment. The build in the FAQ:
HTTP://www.wowhead.com/?talent=hmZxVbdq0sAuqox0e
is a good one, just be sure to fill up the enhance tree first. Also, you may find (if mostly PvE) that at lower levels, the points in Imp Ghost Wolf will serve you a bit better in Improved Lightning Shield, especially if you're in combat with more than 1 mob.
Edited, Aug 6th 2008 6:49pm by OzoneSSX