IMHO, you do not need a computerized machine. Many here quilt with a Featherweight which my grandmother and yours (or even your great grandma) would have used.
For me - my driving force for an upgraded machine over my old mechanical Viking was an ability to change needle position and the ability to reverse a stitch. My current machine is a computerized Pfaff 2054 which I purchased off of Craigslist. Love it as it has a "dual feed" which Pfaff calls and IDT. I would now die if I had to give it up!
Are you comfortable with your machine? If not what might you want in a new machine? I also have a Brother CS6000i which is computerized and light. I, however, would not want to sew on it 24/7. It stitches well and is very light weight - great to schlep to classes. The "harp" ( the size between the needle and the body) is VERY small and difficult to handle for me. Computerized is not always better.
It is a personal and financial decision that you will have to make. My last three machines were used and all purchased off of craigslist - in addition to the 2054 and the 6000i I also own a used Pfaff 2170 Embroidery machine. You can get some good buys on used machines if you look.