I am debating between a few different recievers. Yamaha rxv-1400 and 2400. Well the only major difference between the two is 10 watts of power and the rs-232 port on the back. I know that means I can upgrade software... but is that important? Will I ever use it? What does it do? For example if the 2400 doesnt do dts-es for example, can I software upgrade it so it will????