You might be surprised...the little amp in the D1 did plenty good with my SR80s, 325s, and 500s. I have upgraded the tubes in my LD amp, though, and I like the little bit of tubyness that's added to the sound. I enjoy having a small collection of less expensive amps to play around with. If I'm listening critically, the LD will usually get the call with my Grados. You'll like having both available to you, I bet
I'll also say that LD has phenomenal customer service. Nothing against the Chinese, but I'll typically prefer buying either American, German, or British. But this is one company where they really go out of their way to deliver a nice product and make sure you're well taken care of. Once you play around with it a bit, I'd really encourage you to find some better tubes for it. You dont' have to break the bank...there are some nice options at the <$50 price point. My Telefunken/AEGs were like $35 and I like them quite a lot.