nishant

Hello everybody, I am new to this forum and happen to stumble upon this when i was looking at Sony MiniDisc portable players. I want to buy a player and also use it as a recorder in my music lessons. I was looking at my options and since so many models are available i was confused as to which one I should go for. MZ-NH900 and MZ-NH1 look pretty recent and advanced models but I am confused between the differences in these two models. Please advice as to which one should i go for. I also wanted to know if MZ-RH910 are available in US and if they are then where can i get them. Please advice. Thanks in advance, Nishant