FlushingDIYer said:
I can't for the life of me imagine what I'd use a nut driver for. But then again, I just use 1/4" sockets and a handle.

I am assuming from that statement that by "handle" you're referring to a flex-head breaker, correct?
Something along this line, perhaps?
The only difference between that and the "nut driver" (or "spinner", as they're usually referred to) is that the flex-head breaker allows you to tilt the socket 90° each way.
Some guys just don't use spinners. Some do. Personal preference stuff. I prefer the breaker, but I usually grab that Proto model above which has fairly aggressive knurling on the handle, so I can use it like a spinner.
I don't own any flex-head 1/4" drive ratchets. I only have those in 3/8" and 1/2" drive.
The little 40970 S-K touted early on in the thread is a nice little piece of work.
They can be had for $15-$22 on Ebay all day long (used in nice condition.)
Personally I prefer the 2875 Indestro (52 tooth), but they're difficult to find and a used one will run you $24-$35 on Ebay. (Duro Chrome equivalent 4575)
Good (but not as nice as those two above) 1/4" drive RHFT models: 77MC Thorsen, 1069 KAL / 4150 Proamerica (same/same)(US-made, not Japan), 11000 JS Technologies.
(I can't remember all of them.)
Tiniest head model (with an amazingly smooth action) is the 2400 (or 2426) Wright. Ebay prices are all over the place: $15-$30 used on Ebay (incl. shipping.)
I have a little Snap-on but the selector knob drives me nuts.
Experiment with your "roto-head" model - I don't know anything about them.
In the meantime, if you're looking for a good standard-type 1/4" drive RHFT, pick up one of the S-K or Wright models - you'll probably be happy with either of them, and not out a lot of money.
This is what I could dig out on short notice. The Powr-Kraft is a re-branded Wright 2400:
(* The Snap-on is a model TM739 - missed a digit naming the file. *)