Question re: Aeronaut / Western Traveller / Tristar Capacities w/ Cubes

Greetings everyone. I'm new here but I've already ordered a black/steel co-pilot (awaiting arrival) along with an assortment of dyneema organizer pouches (all sizes) and a couple of key straps. I'm eagerly awaiting this bag as I plan to replace my current Timbuk2 XS messenger bag with this bag for use as my day bag. In it I hope to store an ipad, kindle, a large moleskine notebook, as well as my phone, ipod, and possibly a lunch (if I can fit it - will see when it arrives).

My co-pilot order made me think about possibly replacement my standard carry-on with possibly some Tim Bihn luggage. Before I do that though I wanted to ask a few questions about the larger Tom Bihn carry-ons.

To start with, I've always been a wheeled luggage guy. I currently am using a Tumi Int'l Business carry-on, 20", and I couldn't be any happier with the way its worked out for me. I use it in conjunction with an assortment of 7 or 8 assorted size packing cubes from Eagle Creek which allow me to pack a RIDICULOUS amount of clothes within it. My last trip was 2 weeks and I still had clothes left over. That being said I tend to be a major overpacker (packing 2-3 shirts per day). I tend to roll all my clothes in the cubes to maximize space.

With that background, can someone let me know what bag would be an ideal fit for maximizing the amount of carry-on items while allowing me to keep it organized in either my Eagle Creek cubes or Tom Bihn cubes. With the Tumi's square shape its easy to see how the cubes fit together in one large cavernous compartment but in all the TB bags there are so many different compartments and different possible arrangements its hard to see how the cubes fit in the bag or how many of each will fit. Can anyone who uses the TB cubes in conjunction with TB bags know which bag holds the most of these as well as what arrangement they go in? Lastly, are Tom Bihn cubes comparable to Eagle Creek cubes in terms of size/quality? If possible, I'd like to keep using my Eagle Creek cubes since those were pricey and quite an investment already.

Thanks in advance for any / all replies.