Assuming you want/need this much light and have the budget to make the purchase all at once, can anyone think of a combination they have seen in the last year including all special offers, that rivals the everyday price of the Dinotte Li-Ion Edurance Series Dual 200L with taillight at $429 and $434 depending on the lense combination that you want? I can't.
For that matter that matter the 600L and 200L and taillight at $599 is a pretty good deal, too.
If I could apply the night riding knowledge I have learned the last year and be considering solo riding instead of only group riding and could talk myself into this budget, these are the only two options that I would consider in today's market. And it looks like you might be able to upgrade cost effectively like the first to second generation Li-Ion upgrade package.