If you continue to go cordless, might consider going with the same brand and size to keep your batteries consistent.
Makita is a good place to start, they make pretty good stuff in general.
I would go with a corded circular saw like the Makita 500 series.
Best bet, if you're selecting off-the-shelf, is to pickup several different saws, check out the "feel" and features.
Makita, Milwaukee, DeWalt, Hitachi all do well. Porter Cable is a tough call, I have several excellent older tools by PC but the new stuff has "changed" a bit to fit the DIY market.
Don't know if Home Depot has made it to your location but the Ridgid brand is not bad either.