I am considering buying a new double din for my 98 240SX, but I have limited knowledge of car audio. After going through some reviews I have narrowed my choice down to Pioneer AVH-P4100DVD and JVC KW-AVX720. Both units are available at http://www.dealrocker.com with good discounts. Can anyone point me in the right direction and help me to choose the best one?

Any views and suggestions are welcome.

BEWARE BEWARE BEWARE !!!! DO NOT BUY FROM WWW.BUY.COM!!!!!!!!!!!
take my advice please you can get the same radio from other places for about the same price and not go through the hell that is buy.com
that being said the pioneer radio is awesome but go for the 4200 instead of the 4100 its newer. I'm currently shopping for one myself but i have to wait till i get my issues with buy.com settled first. i made the mistake of ordering from them and be assured i will never make that mistake again i don't care how cheap it is.
the main reason why i like the 4200 is that the usb and aux are in the rear other than having a little bit larger screen the 4200 and the 3200 are identical.