Room Treatment, Panel Sound Diffusers


So I am setting up a third sound system in a spare bedroom.  I want to really get the walls and perhaps ceiling treated for optimal sound.  The bed will be taken out.  I will put in high quality duplexes like the ones sold by Cullen Cables.  However, there are a bunch of different sound diffuser panels with many being quite expensive.  I am going to do the install myself so nothing too complicated.  Looking for advice on the type of wall treatment that works but won't break the bank.

Thanks!
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The bargain/high value approach is a combination of Owens Corning 703 acoustic panels and Synergistic Research HFT. OC703 is cheap and easily cut to size with a knife, then all you do is wrap with fabric and presto, $500 acoustic panel for $20! This material is absorptive and very effective so a little goes a long way especially if used in the corners like this https://systems.audiogon.com/systems/8367 

HFT don't work like conventional old school diffusers but they do make a huge improvement in clarity, detail, and imaging. The ones made for speakers and the ones made for walls all work the same, so if you don't want them on the walls you can still do the speakers.
+1 millercarbon.
However, if you don't want to DIY, I used a product called Primacoustic.
They were purchased from Sweetwater Sound. Treated all four walls plus the ceiling in a dedicated room.
Placed panels at all first reflection points, plus others at random.
Used system setup guidelines from Jim Smith's book Get Better Sound.
Improved the sound more than anything else.
Very happy with the results.
The room and the setup will give you half of the sound you will hear.

“Looking for advice on the type of wall treatment that works but won’t break the bank.”

Call GIK Acoustics, their acoustic panels are quite inexpensive once you consider the free professional advise and finish. If you want panels that looks like they were made in your garage then go with Owens Corning :-)

I did my entire room - 15’D x 30’W for $1500 / 20 acoustic panels...that’s $75 per panel.
Many thanks for the replies!  I did get one message questioning why I just didn't do a Google search for acoustic panels.....