@Mista Lova Lova I'd say send it and get the Susvara.
They're power hungry yea, but most modern amps have more than enough power, it's often a matter of
quality of the power from the amplifier rather than
quantity, which is what higher end amps provides. I've owned most headphones now and other than the TCs, the Susvaras will scale more than anything out there, including all estats due to how well balanced they are. What I can say is if you're coming directly from HE1K to Susvara on the Burson, you will likely find bass/dynamic to be lacking on the Susvara in comparison, but this is due to the quality of power rather than quantity and will quickly remedy itself after upgrading amp. However, the bottleneck then quickly becomes the front end source: DACS, streamers, etc... it really is a never ending cycle.
But yeah... I'd always say get the best headphones first, then worry about the chain - so go for the Susvaras!