Maybe I am missing something, but why would you want a deck with XLRs if you intend to use internal mics? Kind of opposite ends of the spectrum. Generally, I think the mics are the most important (gear) choice as far as quality goes, so I would think about that before trying to figure out the recorder...
Personally, I would also avoid the DR-70D, as there have been some issues (see the DR-70D thread).