Old NAD or newer high powered Denon?

I found a used Hafler SE120 and SE240.
Do those sound any good?

Hi Celtic66.
Thanks so much for the response.
I listen mostly to streamed digital.
Pandora and iTunes and ripped cd's on a media server.
I listen to all types of music but my favorites are
jazz. My favorites are Nora Jones and Linda Ronstadt.

My budget is as low as I can go to get good sound.
Ideally I'd like to get an integrated amp or a receiver.
I don't mind buying used or older equipment.
I will be using the Vandys with a subwoofer.
I know that the NAD is a warm sounding amp and together with the 1C (which I think is warm sounding as well), I am getting a boxy sound that I am right now disappointed with.

What if I use the NAD as a preamp and just get a power amp?

Thanks for all of your comments.
@Tmsorosk - What do you think I need to drive the 1c's properly?
It's clear that I don't have the equipment do drive them properly now. Do I need to put in another $1000 or so?

@Ths364 - so how did the sound change when you changed amps?
I am toying with the idea of using the preamp of the NAD and just getting a quality 100 WPC amp of some type.

Thx all! I would love to have a tubed amp but I am thinking it's not practical for me. I have small kids and I can imagine missing tubes.

Any recommendations on a solid state amp?

Regarding budget: $500 max

Thanks all. You have all been a great help. I'm gonna look for a garage sale st70. Wish me luck.