Lots of choices are out there.

Tradeoffs to consider:
Rivers versus lakes
Solo versus tandem
Day recreational use versus multi-day trips
Amount of portaging involved

As someone else mentioned, avoid a Coleman - they are junk.

Lower cost options:
Gruman or Alumacraft aluminum canoes - they last forever and you can do a lot worse than this option

Old Town Penobscot - a good, all-around canoe at a decent price

Old Town Discovery - a cheaper, heavier alternative to the Penobscot - I'd choose the Penobscot over the Discovery simply based on weight.

Likely Old Town and Mad River make more models in this range.

Higher cost options:
Bell Canoe Works makes canoes that are simply beautiful to look at and paddle very, very well and are lightweight. However they are not inexpensive.

Wenonah canoes - not as beautiful as Bell, but they paddle well and are light.

There are many more brands out there. Bell and Wenonah are made in Minnesota so I'm more familiar with them; I have a Bell solo and a Wenonah tandem.

I would rent or borrow as many canoes as you can before you buy one. Buy something you like as you'll likely be stuck with it for a while.