I'm in the hunt for one also, under the assumption that being able to do a decent hem would have me sew more knits. But that's a lot of money to invest on hemming a handful of tee shirts.
I looked at Babylock. They started at $800 and into the several thousands. Huh?
Noooo....
You read mixed reviews on all of them so that's not all that much help. At Pattern review I did get a couple of Private messages with suggestions.
I've heard maybe more good then bad about the Brother and some good info on a Singer, though I'll need to check my notes to see if it's a combo or solo cover stitch.
Meanwhile, I've decided to just plop a bit of money aside every month so when I do make up my mind there's much of it already gathered up.
On the topic of feeling like you're being self indulgent spending on yourself, "Santa" has acquired a rather good quality tablet for me. It's bigger, so I can see things on it, 13 hour battery life so I can look at whatever I like in a days time and has decent cameras both front and back. Good being 5 and 8 mega pixels. Did I mention a good camera, big enough "viewfinder" that I can actually see what I'm looking at? Still, I could have gotten an adequate for my needs one for much less. This one was 5 times what the small one was.
I figure I can use it to watch videos of home repairs while I do them. That way I might stop feeling like it was self indulgent.