Gas:
Model Price Bar
length
rating
Heavy Duty
Husqvarna 445 $300 18 75
Stihl MS-251 C-BE $370 18 75
Lighter Duty
Stihl MS 180 C-BE $239 16 81
Echo CS-352-16 $270 16 75
More at Chain saw Ratings | Consumer Reports

Rental:
20" Home Depot $46/4 hr. - $65/8 hr.

Electric:
Model Price amps Bar
length
rating
Stihl MS 170 C-BQ $300 13 16 70
Worx WG303.1 $100 14.5 16 68
Craftsman 34119 $80 12 16 57

Battery - Cordless:
Model price PM
rating1
CR
rating2
Bar
length
v ah cuts/chrg
EGO CS1401 $300 76 14 56 3, 4
Stihl MSA 200C-BQ $380 66 12 36 4.5
Stihl MSA 160 C-BQ $350 5 12 36 4.5 192
Husqvarna 536 LiXP $800 4.5 14 36 3 112
Ryobi RY40511 $200 54 14 40
Oregon CS250S $400 4 47 12 40 4 112
Robi 40502 $290 4 12 40 1.5 44
Robi RY 40510 $200 34 12 40
Makita HCU02ZX2 $650 3.5 12 36 3 86
Kobalt KCS 120-06 $180 3.5 12 40 2 42
1. Which Battery-Powered Chainsaw Should You Buy? | Popular mechanics
2. Chain saw Ratings | Consumer Reports

Links:
Chain saw Ratings | Consumer Reports

last updated 14 June 2015