Wow, that is very helpful guys!

I started out considering a long pump under the top tube, but the comment above re: how it interferes with carrying the bike makes me now favor a pump attached to/under the water bottle cage, versus carrying it in the pannier. Also am less interested now in CO2. Thank you cyccommute

Tourist in MSN - your comments and the dedicated thread are a wealth of information, as usual.

After reading up, I ordered a Lezyne Micro Floor Drive High Volume and will probably carry it in a bag or pannier. Maybe adapt it to the down tube if I can. Thanks again!!