I have a Pfaff and Bernina sewing machine and love them both. I really like the IDT on the Pfaff and would probably purchases a Pfaff. If you can find a good used one I would try to get a 1471, 1473 or 1475. These are good machines and will last forever.
On the serger, I like the jet threading on the Babylock and own 3 BL serger. I also have a older Bernina serger and it does a good job, just hate to thread it.