What do you mean, a 17 inch CRT is a 15 inch LCD? That makes no sense.. Although its always a bad idea to go smaller or slower then what you originally had. But if you have no choice, then you cant really complain. I dont know how old your are, or the bills you have to pay.
But if you need something simple for moderate use, and light for ceremonial travel. Then a 15inch is not so bad. Just make sure you get a good one. But if your looking for something to totaly use, for everything. Then quality is a issue. If under those terms, then get a 17 inch LCD and make yourself happy.
Finished With TF.