l_macd- Oh such good advice for me. I am a Calibre newbie.
I have only been into ebooks for 2 years with the old Sony prs-300. I am not a wiz with the computer (old age) but got into Calbrie because I ordered a Sony prs-t1 and it finally came.
I have been getting the books lined out with Calibre and DropBox and now a spread sheet. So your "two" library system is only going to add to the splendor of KISS.