Welcome! From that intro I'd say you'll fit right in.
Lightweight portable model? Most lighter machines are straight stitch only. There are a few exceptions. Kenmore had a 3/4 size machine capable of some zigzag stitches. I don't remember the exact model #s.
For straight stitchers there's the Singer featherweight at 11 pounds. Small, light, popular and expensive. The Singer 99 weighs in at about 23 lbs. There's also a rare aluminum version. There are some Japanese clones of the 99 out there made out of aluminum too. The Belair Bantam is one, Sewmor sold one too. I occasionally see 3/4 size Singer 15 clones. Not often, but they're out there.
These are just some off the top of my head. There's others out there too.
Rodney