The new 140 Lincoln can be used for aluminum with an add on kit - wire feed moves to the gun due to difficulty getting aluminum to feed properly through cables.

The 110 welders cannot generate enough heat (current) for anything over 3/16" thick. My Lincoln 135+ works great, but I ended up buying a second welder for welding on frames, suspension brackets, crossmembers, etc. If you are only going to use the welder for hobby welding the 140 amp will work good for you, but If you can afford the 180 amp/220volt version and have a 220 outlet buy it.