Ok. I've decided on a scope. The Owon SDS7102 with VGA and LAN module (newer models).
I've been thru the detailed reviews of this model which also explained some of it's failings.

$430 including shipping from China. The Rigol seems almost the same price once shipping is added in.
http://www.ebay.com/itm/New-OWON-100Mhz-Oscilloscope-SDS7102-1G-s-large-8-LCD-LAN-VGA-included-3-yrs-wa-/270857241956?pt=BI_Oscilloscopes&hash=item3f10598564

(doesn't need to be ebay, Amazon has it and it's on AliEpxress too)

This is only a little more than the Rigol 1052 / 1102 but it has 10M sample storage, which blows away anything else in this class. I think deep storage is going to make a big difference for this project. It will allow me to capture an entire sequence of data going to/from the ASIC in full resolution. With this scope you can capture 1GS/s right down to 1mS/div and then zoom in. Or say with 5nS samples I could record 50mS of data, about 200K of data, easily enough for an entire work unit, even with both channels to compare data. Hands down way more than anything else in this price range.

Other nice things: 8" display with VGA output, and LAN connection to PC (also includes USB device and host modes).
This scope has been reported to show 200MHz input stage bandwidth.