Help on choosing a amp for Dali Helikon 400 mk1


I am looking to spend $3500 on a used SS amp . I listen to Jazz on vinyl mostly, rock on vinyl and CD.My pre is a BAT vk 31.Room size 25'x16'

I appreciate you're feedback, thank you!
128x128marcval
thank you for you're response.
witch one of you listen to detail not to bright sound with some warmth.
does that make sense?you know like listening to Coltrane, Mingus or Nina Simone and feel like you are they're.
I find that the Nad M3/Dali Helikon 400 mk1 combo very warm and natural, but did feel I needed to upgrade my cd player (Rega Planet) in order to achieve that "live" sound that I dream of. I now have an Esoteric sa-60 source and am thrilled with the results: natural, warm, and life-like. Not true "live" sound, but pretty darn close.
Thank you Jackarosey, I like NAD,they put out excellent product for the price i still use it in my a/v but i need a power amp since i already invested in a pre.(BAT V3ix)
I forgot to mention, the Dali 400mkI I listened to was modified with an other tweeter and an other filter.
Ive had a pair of Helicon 400s for almost a couple years now. I have used a Simaudio Equinox SE CDP with a BAT 300x SE (6H30 tubes and BAT-PAK) with excellent results. I tried the pre-out of the 300x SE with a VK 220 w/BAT-PAK (125 wpc) and wasnt too impressed. It wasnt bad, its just that the 300x SE bested it, and made me realize how good this integrated is. I have also heard that the BAT 250 is substantially better than the 220 even w/BAT-PAK. I see the BAT 250 used on Agon for $3000-3500. I bet it would be a great combo. My last 2cents is that the VK 31 with powerful SS like a Simaudio would probably be quite good. Simaudio is known for its detail and strong but taught bottem end, which could really highlight not only the jazz you admire, but rock on vinyl, and accentuate and round out the pluses of the VK 31. Im thinking the Simauaio Moon w-5 for a/b $2400 used (190 wpc, which easily translates to 250+ wpc in other brands). I have listened to the Helicon 400s also with Simaudio I-3SE (100 wpc) and I-5SE (a/b 75 wpc) and was still impressed. Word.