OK, if you can't find any thermistors good for +125 on eBay, they probably don't exist, and you are right to use the PT100 - again. Hopefully it didn't cost more than about $5 anyway. I really can't comment on their use without amplification. I needed the accuracy they can provide, it's just that I was able to use the DS18B20 and preferred to go that way. I think it would be better to go with amplification - the better support would probably justify the dollars.