Hopefully Dataviz DocsToGo will be out soon, I know they are delayed until Q1 of this year. I have used DocsToGo on Palm & WindowsMobile OS devices and have been very happy. DTG has the ability to edit and create docs on WinMobile Smartphone OS where the native Word & Excel Mobile apps could only view.
Their pricing is pretty good as well compared to the others on the market, WinMobile $29.99, Palm OS 29.99 so I have a feeling the BlackBerry version won't be much more.
Documents To Go for BlackBerry: Word, Excel & PowerPoint on your BlackBerry Smartphone