Well, I decided to bite the bullet and get the extended battery. I was getting about a full day on the regular battery using 3G and, if today is any indication, I will get about a full day on the extended battery using 4G, which I left it on today. That being said, I guess it was a good buy because I'm going to assume I can get close to 2 full days of use while on 3G...and only use 4G when I'm downloading or possibly watching videos or movies (if we ever get Netflix access!). (Up Time is 13:52, Awake Time is 4:24, and battery is at 23%)
So, now I need a new case to accommodate the extended battery.. After doing a lot of surfing and reading, I ended up purchasing the Seidio Active case...seems like a winner for me and I'll post a review when I get it.
As an FYI to anyone who is interested, I found the best price on this case at http://www.cellpower.com. The customer service was excellent before my purchase...very quick to respond to my emails...and I even waited until they got the case in stock before ordering. A very good experience and the best price I could find online!