My recommendations:

1) Go as large as you can accommodate and find for your budget. Larger wheels and height can be an advantage. You can cut small things on a big saw, but can't cut big things on a small saw
2) If you can be patient, try to acquire a "big" machine used
3) If you can't find a "big" machine used, there are great options from Grizzly, and others that will fit the bill nicely
4) Keep in mind that most larger saws do require 240v for operation. If that's a limitation for you, find the stoutest 14" saw you can afford that still runs on 120v power