IMO, for you, buy a 135a 110v Lincoln. You can buy tips at home depot at night on the weekend when the welding stores are closed.
For up to 1/4", that will work just fine. Use 0.035" flux core.
You reall yonly need more if you are into heavy fabrication. I used my 110v lincoln for 6 years, then upgraded to a 220v lincoln, which I've used for ~2 years now, 0 problems with either unit. I've built 4 vehicles with these, and have not had a failure.
Did you see my post about that bent driveshaft? That was done with a 100 amp 110v lincoln. That 1/4" tube bent, my welds are fine. These days, you can get a 135a 110v, which gives a touch more power.
Don't get me wrong, a miller is nice, but *you* are paying about $300 more for blue paint and a name.
Now, if you were doing heavy fab and/or lots of fab, I'd have a different answer for you.
Besides, if you spend $350-$400 on one now, and you want to upgrade later, you'll be able to sell that one for a very good price.