Based on name alone, I would recommend the Salomon, although I honestly have no experience with any of those boards.
Generally speaking Technine and Salomon make higher quality boards than LTD, Avalanche, and Morrow.
However, if you are just going to go a few times a year and are just interested in having fun rather than on progressing seriously in the sport, any softer beginner's board would suit you just fine, including any of the boards you listed.
Consider looking at websites such as sierrasnowboard.com, backcountryoutlet.com, evogear.com, rei.com, eBay, and dogfunk.com for higher quality boards left over from last year. Check out the boards on sale. You should be able to find something better than what you listed for your price range. Look for a beginner's board or a freestyle board. Good luck!
Oh, and for your weight, 138-140 may be a bit on the small side. A good all-mountain size for you would probably be a 141-144. Just for comparison's sake, I am 4'11'' and 105 pounds. My first board was a 143. My two current boards are a 145 (which feels a bit long to me, so it's more of a freeride/powder board), and a 141 (perfect length for me, my freestyle deck).
Last edited by lilfoot1598; 12-20-2009 at 08:25 PM.