Maybe long arming isn't Nilla's cup of tea - it's not for every quilter. There are folks doing stunning work on their domestic machines, starting with Diane Gaudynski.
I don't have one personally, but I have friends who swear by the Juki straight stitch machines, the Juki TL series. The harp isn't huge but it's tall. Janomes come highly recommended, too.
Good luck, and I hope you find what you are looking for.
Janet