With DD i had singlets (about 5-10), the bonds wondersuits and then just the short sleeved and no legged bodysuits.

We didn't use pants or tops on her until she was well over a month old, the bodysuits and wondersuits were perfect.
You will use those short sleeved ones HEAPS over summer, i would suggest Muslin Wraps for a summer baby too (am about to buy a few for #2) as they still provide warmth but don't make them sweaty etc.
I used to wrap DD in her muslin wrap and then when she went to bed i had a nice light blanket for her or sometimes just a sheet in summer when it was too hot but she still wanted to be wrapt.

HTH... prob not as i ramble.. enjoy it all