Get the SE P990. Honestly probably the best phone I ever had, has everything you need, especially the capabilities of viewing excel spreadsheets. The new R9EA firware revision makes it really really stable, fixes all the bugs that were there from the original release, and even adds some functions.
I am actually selling mine right now on ebay. Here is the link: http://cgi.ebay.com/ws/eBayISAPI.dll...1665&rd=1&rd=1
Go there to see why exactly I am selling it, I don't feel like reitterating it right now.