Best Used Amp/Preamp/CD Combo Under $1k

The Mambo is great, class A rated power is warm. I believe it also has a built in DAC so any decent cd player will work great.

Your thought on Acurus amps is way off base. They are much more harsh, almost crude sounding. Extremely different than the Aragon which is warm class A sounding.

I still think you need to think tubes. You are asking a fair amount to come in under $1K. I did not think el34s could deliver the bass I wanted until I went to the TAD-60 amp and I was astounded by the bass. These can be found at around $800 to 900 used. A reat bargain. A good Class A SS amp may sound better than the Acurus equipment but only tubes will sound like tubes and only tubes will really bring your Cometes to life. Do you have any chance to borrow or audition a decent tube integrated like the TAD, PL1 or 2, or the Cayin 23T and listen to it in your room? I am sure you know the Cometes will only extend so low. I am assuming you want what Bass they can produce to be tight and crisp. I believe any of these amps will deliver in spades. If you could stretch up to about $1500 I think you can get close to the sound you are looking for.

If I had your speakers and 1K, I would pick up a used Rega Planet 2000 and a Jolida 1501RC (hybred) integrated amp. Lots of power, many cheap tube options if you want to tube roll, and I have heard the amp with Triangle speakers (not sure which ones) and the sound was good.

I use to have an Aragon 2004 MkII. Bass control was amazing on my older Mirage bi-polar speakers. However, the overall sound was dry, non-musical. From there I went to Counterpoint SA-220 hybrid tube amp and SA-2000 preamp. Yes, the bass control was not as good but the overall sound was much more musical, more depth, sound stage....airy. I was lucky to not have any mosfet issues with the amp since they are prone to failure. I also owned an AMC EL34 tube amp that was very nice sounding for the money but did not have the power to drive my Mirage (power hungry) speakers properly. I had to bi-amp using a solid state amp on the bottom which can be complicated and costly. I agree with the prior posts - an integrated, hybrid tube amp ex) Jolida, Ming Da, Cayin, TAD will probably give you the best bang for the buck. I own a TAD preamp and like it alot for the money. Pacific Valve Audio sells - Chinese made hybrid tube gear. Some of it offers good power, good sound, and at a decent price. Hybrid tube amps also have fewer tubes versus pure tube amps - so typically the tubes can last years. I know someone (NOT ME) trying to sell a Ming Da integrated tube amp for $500. I beleive it's 50 or 60 watts per channel. I've heard the integrated amp through some Paradignm speakers and was impressed. However, the bass control was NOT great.
Lastly, this same person also has B&K 2020 (I think) solid state amp that is not for sale. He has the B&K in another system with a NAD 545 cd player, and larger Paradigm tower speakers. I typically prefer tube sound but must say the B&K offers good detail, is darn musical for a SS amp, has good bass control, and has tons of power. B$K are very reliable and obviously do not require tube replacement. I think he paid less than $300 for his via eBay. So given the price I was even more impressed - a GREAT bang for the buck!!!!
I had a Jon Iverson Eagle 2 amp purchased for $350 or so here on Agon. It also has many of the qualities described for the B&K. I wish I kept it.
Finally, NAD and Cambridge typically offer a good value for the dollar
Good luck,
Paul

If you're not stuck on fancy names you might consider a Rotel RCD-1072 CD player with a RA-1062 integrated amp. Both well reviewed, no reliability issues, plenty of power and good bass for your rock, remotes for both, and money left over for cables and more CD's. I know, not a fancy name but after years of buying hi end stuff I have returned to Rotel and I'm more satisfied than ever.