Amp upgrade for my Peach Tree Deco? on a budget

Hi, currently have a modest 2 channel system in our living room. Here is the set up
1.) Peachtree Decco
2.) Focal 706V
3.) Cryo Silver plated USB
4.) Windows PC
5.) 90% of the time using as my source
6.) PS Audio Duet
7.) DH labs power cord for the decco.
8.) DIY Speaker Cables (Low inductance design)

I have read that the decco's weakness is the amp portion and wanted to know what 2 channel amp you would suggest. Any suggestions in the less then $500 used range? Thanks
Onix sp3. An amazing, beautiful, little integrated tube amplifier. It destroys the idecco's amp in every way. It's soundstage is precise, differentiated, and palpable. It can be tonally gorgeous. A huge step up from the decco's amp. You can usually find it used @ $450.
If you like tubes look at a used Vista Audio either the I34 or I84. I84 has 15 wts and a sweet sound.
Thanks Iramirez and Grinnell for the comments. I have no clue about Tubes
The suggestions you've received have been integrated tube amps and seemed to be geared toward you replacing the whole unit and not just the amp. While they're probably very nice amps, they don't seem to answer your original question.

I have the iDecco and use it with a modified Dynaco ST-70. It's more than enough power for my 93 db efficient Decware ERR's. You may find that you'll need more than my 35 wpc with the Focals (especially if you're going solid state).

I've tried out my Peachtree with my Sumo Andromeda II, and and Adcom GFA-5500 and 5802. You could easily find a 5500 for under $500 if you're prefer leans to the warmer side of solid state electronics. The Sumo occasionally sells in your price range. I'd suggest the Sumo if you prefer a more focused, detailed sound. The earlier Adcom GFA-555's will also lean in this direction, but I feel the Sumo does a better job with resolution and balance. The big winner in this group for me was the Adcom 5802, but they usually sell for over $800. It has the tonal balance of the 5500 with better resolution and bass (IMHO). If you can actually find one for $500, it's a great amp to have available and would be a big upgrade - not just in terms of wattage.

Others I've heard but not with my Peachtree are the B&K EX4420, Rotel RB-1080, and Golden Tube SE-40. Out of everything I can think of right now that would be within your budget, the B&K EX4420 would probably be a great choice. I haven't seen one for a while, but I've seen them sell for anywhere between $250-600.
i used my decco with a emotiva xpa-2 to run magnepans with very good results. i see you use pandora for most of your listening and i think if you possibly tried spotify or mog with their 320kbps stream and the better sound quality you may get some benefit. i also see some inexpensive hafler and parasound amps for sale here so you may be able to try one of those at a reduced price. good luck
Thanks for your ideas. I will begin my search ! Cheers...