i just bought a sony nv-u51 on ebay £132 posted and its miles ahead of the old garmin i3 i had so i'd recommend the sony.
it gives you 4 different route options(fast,optimum,slow and nice..yes i said nice

),about 7 options on your transportation means from fast/slow car,motorbike,foot,truck and so on.
its 3.5'' touch screen is very clear to read which is very useful on a motorbike however it is not bluetooth compatible and has no earphone socket so the audio directions are useless and you must connect it up to the mains supply when you are do any software updating.
hello from a newbie by the way