Yea, Makita and Milwaukee are probably the best quality battery tools and the most expensive Ryobi is probably the lowest quality. Stanley / Black and Decker own Dewalt and Porter Cable now. I think they position Dewalt as the higher quality alternative though they seem pretty similar to me.
I have the "new" Porter Cable 20v system and like it. There are lots of tools available (palm sander, nail guns etc). I use it in my shop every day and have had no issues. I stumbled on 4 packs of extra batteries for $20 in Lowes once and bought all they had.
