Ok this all depends on what firmware / features you want to run and if you want to be able to do firmware updates etc.
If you are running a firmware of 528 or earlier then the LED cards are cheap (£10) and will be fine, anything later than this and/or you want to be able to do firmware updates you will need an LCD programmer.
Link to LED programer
http://www.racersinexile.org.uk/Hobb...0_3763526.aspx
The LCD programmer is £20ish
http://www.racersinexile.org.uk/LCD_...0_1607319.aspx
And this gives you several benefits over the LED card;
1) You get a description in words of each adjustment your making on the screen (so you don't have to remember what parameter 5 actually is)
2) You a description of the meaning of the setting value too (so instead of getting "7" you get 85% max brake on the screen)
3) You can use it either as a firmware update interface or an interface to make adjustments on you PC (incase pushing little buttons doesn't appeal to your inner geek)
4) My fav' ... the LCD programming box can hold the values for 3 individually named profiles in it so you can update ALL of your settings at a single stroke. I use this to keep a "Smoooooooth offroad", "PUNCHY" and "Slippery When Wet" settings stored so if the grip changes I can get it all done on the way to the rostrum if needs be
Hope that helps ... I will post up my profiles when I get a moment (downloaded directly from my LCD card of course
)