Open Source Personal Financial Accounting Software

For years I used Intuit Quicken to keep track my checking, stock trading,... in Microsoft Windows PC. Now, I used Ubuntu Linux most of the time. Thus I'm going to find an Open Source software similar as Intuit Quicken in Microsoft Windows. GnuCash, Grisbi or Homebank, which one is good? Which one can import my stuff from Quicken and export tax in TXF format? Let Google to find out other's comments and download to experience by myself