I started with a straight stitch singer built in 1929. This one is black with gold decals. I can sew almost anything with it. Bought it used for $125. Trick is to keep it well oiled and change your needles for every project.
Like Steve I'm running a couple of Pfaffs. Mine are different than his. One is a model 460 with a computer control. The other is a walking foot model a 1245. I also have an Adler and it's a thumper but it can sew plywood!
You can get a good used industrial for a reasonable price. If you keep it lubed, and some have oil baths, It's rare that something will go wrong. Knee controls for presser foot operation or foot controls just can't be beat.
I buy needles in packages of 100. Different types for different materials.
If you plan on producing 50 - 1000 garments a year the heavy duty domestic units are not going to cut it. Most of the warranties are void if you use them for comercial use. Read the fine print.
The Industrials will stitch up to 3500 stitches per minute, domestics 200 stitches per minute
Also I use 1-2lb cones of thread, large bobbins. If you are serious about this, I think I would hold off, look for a good machine, see who in the area services machines and see what they are selling. If a machine breaks down even if it's covered under warranty how long is that machine going to be out of commision?
If I look around my shop I have thousands of dollars invested in Sewing machines, cutting tables, presses and tools. I'm a one man operation! I know Steve has a number of machines and tools. Rocky as well. For us to do this properly and have good quality product and if you want to compete with the big guys, you need good tools.
as well as have the knowledge and experience to use them.
However a hand sewn kilt is something of beauty, good eyes, good needles, proper thread and materials and patience. Another route to follow.
Figure what you're going to make with what materials. The do everything machines are may not give you the results you desire.