In my opinion you've already got the best! I've used QuickReports, Piparti (early ReportBuilder), Crystal(!) and ReportBuilder and I've written a few reports by sending commands direct to the printer. As far as I'm concerned FastReport is much better (although I haven't tried Rave - nor will I).
Is it a recent version of FR? The PDF output for us is fine.
They have some good examples of writing reports through code on their website I believe and if you're looking at re-writing all the reports in A.N.Other reporting product why not, instead, use the opportunity to re-write the reports in a more maintainable way using FR? (Assuming that's possible, of course). Perhaps a cleaner approach to the code of the report generation will make it easier for the FR converter to create the RTF/DOC output...
I've never had much luck generating decent RTF versions of reports from commercial report writers. The only decent output I got was through lovingly hand coding every report using hundreds of '{','}' and '\' and spending days reading the RTF specs. Never again!
A lot of it appears to be down to the order you add the text/lines/fonts/styles etc to the report and the RTF generator can find it difficult to get the best rendering - I think.