my occupation for the last year has been a welder, but i have been welding for about 4yrs b4 that, i would not get a 135, if you ever need bigger for any reason you will have it, if not, your screwed, i have used the millermatic 135 &175, and the lincoln 135 & 175, plus numerous other sizes. My boss has been a welder for aobut 30 yrs professionaly and he says that lincoln makes the better stick welders and miller makes the better wire outta the two. I would have to agree, but that is just my personal preference. I am currently borrowing a miller 135, it is ok, kinda wimpy (from the 210 & 250 we use at work), but i wish my friend had a 175. You have more options with the 175 than the 135, i dunno.
i also use a tri mix gas; argon, co2, and oxygen, which is awesome. especially for mig spraying
personal preference i am partial to blue over red