You must have the 2141 because the 2145 hasn.t been out that long. i have had a 2145 for about 4 months now and have no complaints, it's a lot quieter than my 2141 and a bit more powerful.
You can get the vein rotor, and rebuild kit for $100.
http://www.tooltopia.com/ingersoll-rand-2135-53.aspx
http://www.tooltopia.com/ingersoll-rand-2135-tk2.aspx