I still like my N gauge. I have this weird theory that HO is just big enough for delicate, highly detailed rolling stock and locos that, ultimately, I will destroy. N is small enough that the detail level is good, but somewhat limited. Everything looks good from a distance, and there's much less to break. Part of it is that you can get the whole loco in the pam of your hand without worrying about what to grab onto. Shell removal has proven to be more of an art than a science, but DCC installation is pretty straightforward (I only buy plug-n-play). I just started to get into DCC with my N scale stuff, and I've been impressed. The best part is if I totally pooch something, I'm not out more than $75-100 max (rarely do you smoke the loco and the DCC board at the same time). DCC boards are 25-35 bucks a pop.
Still love O - love the sound, the size, the power, the detail. Easy to work on. It's just the space that kills me.
I argue that N and HO end not being much cheaper at all - my tendency is to run consist of up to three locos, and I end up running longer trains because... well... I can. A good n scale box car is probably $12 -15 if not more. At 3:1, your not saving much...