I have three machines; two I would not drag around, which is why I bought the third: a Janome 720 in disguise (it's actually called an AQS Anniversary model). It is very lightweight and great for taking to classes and sewing at guild and with friends. I think I paid $300 several years ago; not sure how much they are now. It's great for everything you mentioned, but I'd not want to use it for quilting anything large...has a very small throat.
You've gotten a lot of good advice here. Definitely go to dealers and try see what they have, especially used machines. Take your fabric, thread, and quilt sandwiches and try them all out. There are many great machines out there, but you'll know the one you want when you are using it. And be sure the dealer is someone you like and will trust for repairs and maintenance.
Happy hunting!