On my ENO DN I have the whoopies slings for suspension, a structural ridge line, the AHE New River underquilt (fits perfectly and easy to set up) and the Tadpole tarp. Everything is either stealth brown or olive which I love.
I would purchase the underquilt before I got the tarp, however, as you can use a cheapo tarp for awhile but nothing really compares with the comfort and warmth of an underquilt. Beats wrestling with a pad all night!
Good luck and get out there!
+1 on the UQ. I was using a big angus air but a couple weeks ago I got my first UQ. One of the best things I did so much better.