thanks bud
basically, cams can run up to 8" wide wi/ no real problems, and can go a max of I thikn 20" or maybe even 21" (somebody had it???)
for 16s, I would suggest probably 6.5 or even 7" is not a problem at all....
I'm not sure about the tire size tho....the easiest way would be to either use and online tire-size checker where you can punch in your current tire size and then put in your new rim size and it'll tell you what you can use, or jsut take a look on the toyota site and look at the se models w/ 16s and see what tires they use....
I'm using 215/45/17, which is slightly undersized.....215/50/17 or 225/45/17 are the optimum sizes that fill the wheel well a bit better.....
good luck finding your wheels