For anyone debating whether they should get the internal DAC along with the 430HA, unless you have a great DAC you love, get the DAC board. I just spent a lot of time with the new Schiit Gungnir Multibit hooked up to the 430HA with top-tier balanced silver interconnects. I read so much about how R2Rs crush Delta Sigmas and that the Neo DAC is capable but not great. So I thought I had to try and upgrade the DAC. I chose the Gungnir not because of price, but because I didn't want to add too much to the Neo's one-box form factor. The Gungnir may not quite be the Yggdrasil, but it's a serious bit of kit, and my audiophilleo definitely improved upon its USB input. To be fair, it's not fully burned in, but I think you get a good idea in the first 24 hours what a piece of gear is about. It's an excellent DAC, but unless it's going to transform radically, I very much prefer the Neo's DAC with the amp.
Both DACs produce a great sense of soundstage and space. The Gungnir's R2R provides a darker more defined and solid image, which some will prefer. However, the Neo DAC's implementation of the Delta Sigma approach is pleasingly brighter, clearer, and more transparent. At the same time, like the amp section, it has clarity without sounding at all harsh. There is a full and refined delicacy to the sound which some may find too insubstantial and euphonic, but it suits my tastes. I've now tried both sections independently, and I think the engineers at Simaudio did a great job of matching the DAC to synergize with the amp. I think you have to be a fan of lush ethereal spacious sound, but if you are, the DAC option should not be considered an economic compromise.
I have to re-emphasize that I'm using the audiophilleo which does quite a bit to smooth out the D-S and otherwise improve the DAC across the board. With that in mind, I have to say the amp and DAC together, as a whole, produce something special. They both share a common finely-tuned sonic signature which Bob Katz dismissed as "fake-tubey." To my ears, it is the audio unicorn of clear-warmth, transparent-fullness, you know, perfection. To wax poetic, to me, the combined end result gets beyond holographic to hallucinogenic (but legal).