I was also under the same dilemma when HDFC offered FYF Regalia as an upgrade to my LTF Millennia. Asked them for DCP LTF in place of Regalia and as usual HDFC asked me to fill their upgrade form and send it to their Chennai office. I didn't bother myself with it, and chose to keep Millennia as there is no point in upgrading to Regalia unless someone is planning to go for Infinia/DCB upgrade in future.