Looking for database app recommendations

[rybrns]

I'm considering getting an iPhone but need to know if anyone knows of an app that allows synching of Excel files containing lists (e.g., book list, CD list, etc) to and from a PC so that the list on the iPhone contains the file that can be read like a database--each line is a record. The file should be editable both on the PC and the phone and will update in both places on synching. I currently use PocketDB Viewer that works something like this on a Windows phone, but that app isn't very good overall. Thanks for the help!