Topp Mac has a good suggestion there. I would definitely advise against a "cheap" PC since the thing should last you for many years (assuming you don't wear one more than most people do). The look is everything, so hold out for a pretty good one or buy a really good tail coat and pay a good tailor to fix it for you. The tailoring is relatively easy (for a tailor!), so the only realy expense will probably be buying silver buttons.

Or, go on ebay and find a good one like I did. I think I paid about $240 or so.