I really like the Eduard stuff - none for starships, but they have the widest variety I can think of for aircraft and armor, and seem to bring out new sets almost in line with new kits shortly after release. I buy a lot of my Eduard products from Squadron.
I got started with etched parts by just trying etched seat belt buckles
- those and strips of masking tape make some fine looking straps. Then I started using the old Model Technologies canopy frames in addition...and then Eduard came along...and I've been hooked ever since.