the 257 is (or was) 3.7hp. might want to get the 357 as it is now called, makes 4.4hp and 12.1# now like the 036 that has replaced the 034 (4.42hp,12.5#).
The 357 is a ???? strong saw powerwise. There is a couple of people here on the site that love them. I think Gypo still has a sweet spot for that 357 that went everywhere with him a while back. alamia.com has the for $473 including 20"bar, chain & shipping and no sales tax.