I have 2 Bernina's, but before I got the second one, DH got me a Brother CS4000 for a backup and it is a great little machine. The CS6000I has more on it, so I would assume it is even nicer. When my DD was home from NZ, she wanted to begin to learn to sew. She used the Brother and fell in love with it. She was so disappointed to find that she couldn't take it back with her due to the luggage limits and the difference in power over there. The only thing I had to get used to was that, in it's default position, the needle is over to the left. But that is no problem when you use the 1/4 inch foot you just move the needle over. Also, it makes great decorative stitches, 7mm (my Bernina 440 only did 5mm).
Check out the prices on Overstock.com. DH got mine there refurbished with full warranty for a very reasonable price.
Good luck.