I am considering the following: Echo SRM-210 (21.2 cc, 11.4 lbs) Echo SRM-230 (22.8 cc, 12.2 lbs) Echo SRM-260s (25.4 cc, 11.5 lbs) Echo SRM-261T (25.4 cc, 11.7 lbs) - The 210 and 230 appear to be similar except for engine size/power. - The 260s has a larger engine and a solid shaft. I have read that the solid shaft on the 260s helps with smoothness and vibrations. The solid shaft is also suppose to be good for use with attachments. - The 261T has more torque than a 260 because of the gear box ratio change. The 261T appears to be the same as a 260/260s except for the gear box ratio being different. The higher torque of the 261T is supposed to help with tall weeds/grass. Any opinions on any of these?