I use an old machine and I like it fine, it works good. really the things you use the most are straight and zig-zag, all the others don't get used nearly as much.
If it were this is what I would do: do a basic cleaning of it/oil change the needle (really it needs to be changed pretty often) See if you can get a few basic things for it/see if the parts are still available or if new ones will fit
Then I would use the old one until I saved enough for a really good machine and all the accessories. IHTH!!!