I'd sure try using a thinner bobbin thread if that is your main complaint, as new machines are A) expensive; and B) difficult to get used to.
Viking is a great machine. I have owned three of them: a 6460 purchased in 1977 which I love, & still have: a Designer 1 purchased in 2005, which I really disliked, & sold this year; and an Emerald 201, purchased this March, which I am still rather middle-of-the-road on, mostly because of the bobbin & the reverse button. Both are difficult to use. If I could get my 35 year-old 6460 repaired, I'd go back to using it!!!! But overall, they are really great machines with wonderful features!!!!! I wouldn't change machines if I were you, at least not until I tried thinner bobbin thread. Then, I might look for a used machine with a longer neck & bigger bobbin.