I am thinking about getting some 19s for my 6MT and I'm wondering how much it will cost me to transfer the monitoring system?

I'm not sure if you can transfer the OEM system but you can get an aftermarket TPS for about 3-400 these days i believe

When I got my new wheels, they were able to transfer the tps with no additional costs.... just a straight transfer.

on some wheels, you won't be able to transfer, so i just went w/o it. not a big deal.

I was told when I got my wheels that most of the new wheels on the market now will take the tire pressure monitor systems from most manufactures. No one should charge you anything for that.

It varies from wheel to wheel. Some will accept your stock TPS, some will not. The TPS is built onto the valve stem. It is easy to remove once the tire is off (or half off) the wheel.
But don't take the salesman's word that it will fit. If they won't guarantee a fit. Have them take off one of your wheels, pop the bead on the tire, pull out your TPS and show you how it will fit on their wheel. Even if they charge you a couple of bucks to try it, it's cheaper than spending $2000 on new wheels, only to find out your TPS won't work with them.

What happens, if one decides not to reinstall the TPS? Will the TPS warning light go on?

Yes. The light is on in my car the whole time I have my winters on, but it's real easy to ignore.
The dealer can easily disable the system if you're running wheels with no sensors.

Thank you!

Funny, my TPS indicator has never come on since I've changed rims...Go figure.

I just got new wheels today also and wasnt able to transfer the tpms. But the warning light has never come on. I thought it would, but it actually doesnt.

I am shipping the TPS's out and they will be mounted onto my new rims prior to the tires. Yes!

If your new tires run a higher pressure than the OEM ones, you will want to get your TPM system reprogrammed for a higher minimum psi accordingly.

According to my dealer, it's a little random how the cars react to removing all four of the sensors at once. Their experience when putting on winter tire for people is that some get warnings (bell, light or both) some get a warning only after highway speeds for 45 minutes, some get no warnings at all.
I think it might have something to do with whether your spare has a sensor or not. I have a full size spare with a sensor, and my warning light was lit all winter (no bell) and it went out the minute I put my summers back on. Your result might be different if you have a donut spare. Just a guess.

I currently have the stock 17's on my 04 coupe and am thinking to get the sport 18's in chrome. http://cgi.ebay.com/ebaymotors/18-8-...8528QQtcZphoto

I should have no problem with the TPMS at the shop, correct? Should they be able to reset the system and will it be configured differently for the new pressure recommendation?