McCormack dna-1 upgrade or no

I have a McCormack dna-1 with a older gold rev a mod to it and I was thinking about sending it back to McCormack for another upgrade.From what I understand the next step would be around 2500.Should I do the upgrade or sell the dna-1 take the money from that and the 2500 and upgrade to either a new or used amp?

I use Nht 2.9 speakers Btw.Thanks Bob