I'm fond of the ring sling types. I have the Maya wrap and love it but all ring slings are viturally the same.. the over the shoulder baby holder, the kangaroo wrap, etc.. There's a store in Allen where you can get different slings and they have ring slings. www.breesbums.com She sells out of her house I think. Also, the Mother's Gift store at Plano Presby has slings but I'm not a big fan of those but some people like them and to each her own. The things I look for in a sling are:
1) is the material breathable fabric? (you don't want your baby sweating to peices in there! Cotton, linen type fabrics are best)
2) does it have rails? (padded rails look like extra comfort for baby and sometimes they even sew a little pillow inside... but really it ends up closing around your baby making them even hotter and potentially compromising their breathing!)
3) How easy is it to use and can hubby wear it too? (I hate hotslings because they have sizes. Ring slings adjust to anyone so hubby, grandma, the babysitter.. anyone can use it!)
4) how long can I use it? (Ring slings grow with your kiddo too and offer LOTS of ways to carry baby. My 10day old likes to ride facing my chest with her head near my shoulder. I can also carry her in a cradle hold. My 2 year old likes to ride in it on my hip and my 6 year old can ride in it strapped to my husband's back! It's VERY versatile and lasts FOREVER!)
5) Is it comfortable? (My sling has shoulder padding for me, some slings have more than others. I prefer the padded shoulder, I think it helps distribute the weight better)
Good luck in your selection process!