I initially bought a selection of Gerber onesies--classic, simple, and affordable.

However, by chance we ended up with a couple of packages of the Disney Cuddly Bodysuits, and I was impressed with the quality of these.  The fabric is soft, the stitching is good (and not scratchy on the inside where the seams are), and I *love* the adjustable rows of snaps.

As it turns out, we've bought over 50 of the Disney bodysuits over the past 9 months.  At their list price, I find them a bit expensive (they're simply onesies, afterall!).  But I find Amazon regularly has them on sale, and because they are such nice quality, they seem to last.  (Which helps to justify the higher cost.)

I have also bought them to give as a baby shower gift.  (Just an FYI, in terms of gift giving:  The packaging of the bodysuits is minimal (they are individually rolled up and placed into a clear bag.  A small product card is generally inside.  So they don't appear in traditional store packaging.)

I do wish that they came in sizes larger than 9 months, as we're outgrowing them!