Standard Stihl bar lengths for MS460 in a 3/8 drive are 20, 25,28,32, 36 inches. I mainly run Oregon or Stihl bars on my saws. The Oregon bars are good bars and are cheaper more available in my area then Stihl bars. If money is limited, I'd buy the Oregon bar. But... for the money the Stihl bars I think are worth it... especially the lightweight bars in the longer lengths! The saw balance is better and at the end of the day it's worth the extra cost for the lighter bars in 25" and longer bars. The lightweight bar life is the same as the steel bar in my opinion. The draw back on the lightweight bars is heavy handily popping the face out with your bar or if you hang you saw way out on your back cut while you wedge. The light bars can't take abuse like the steel bars. Personally, I've never seen issues with lightweight bars, I'm sold on them. I have a MS460 and run 32" .063-gauge bar never seen issues with that length on power if you keep your chain sharp. I bought my MS460 with a 28" .050 originally and change to the 32"...maybe saw a slight different maybe! Assuming your east coast running .058 gauge and a 25" bar that saw won't have any issues. Personally, I can't see why you would want a 20" on MS460. If it was me, I'd spend the extra $80 and buy the Stihl lightweight. But you should be able to pick up an Oregon bar for around $100 around here. You can save some cash by buying Oregon chain for that bar over the Stihl chain... Stihl chain has just priced me out for the performance different between the two brands. When cash is tight, I use to buy Oregon bars. Now, if I need to replace a bar... I buy lightweight Stihl bars ... it just worth the extra cash to me for extra work and energy saving at the end of the day. I sure there are cheaper bars, but I wouldn't know... I buy Oregon or Stihl bars both brands are good in my opinion. I do run Husqvarna, with OEM bars as well but haven't had to replace a bar on those saws yet, but when I do, I'll put a Stihl bar on... at least my Xp372 anyway. Keep your chain sharp, adjust your oiler tank for tank, flip your bar ever other sharpening, change your drive sprocket as needed (very important), and dress your bar rails you'll get a lot of life out your bars.