u forgot 2 add that some also have an OS(SmartXX V1/2 and Xenium), and the X3 has CongigLive, less attractive OS, but has on-the-fly BIOS editing, meaning u can change BIOS settings without Reflashing your Chip. but if ur installing for som1 else and doing all there setup, it's obvious that they're not interested in all the Tech Details, an probably won't need more then 2 256k Bios banks, so 3rd Gen Chips should be more then enough. for example the X3 ConfigLive is only useful 2 those who make multipul changes 2 there system like changeing the color of the loading sceen, and don't wish 2 be bothered with re-flashing all the time. also note that the OS of any chip just like X3's ConfigLive is useless 2 the standard user, but it is helpful for a First time setup, really makes HDD upgrades eiser, no need for EvoX Boot disks if the OS supports FTP(X3 Config Live does, don't know about Xenium or SmartXX) or your DVD drive won't read your burned media for w/e reason. I also should add that I don't know much about the XBIT as I haven't read much on it, I currently have an X3, witch is my Very First Modchip for any system. now about LCDs, these are only usful for XBMC(dunno if anythin else supports them) really, so unless the person is going 2 listen 2 allot of music and movies in XBMC, this is not needed, also note that there is only 4 options when it comes 2 LCDs, there is X3, Xenium, SmartXX and some LPC add-on device that adds LCD support 2 all LPC based Mods(can't remember the name), also if I missed any, som1 feel free 2 add. so with all that in mind, you also wanna consider what BIOS your Using when it comes 2 XBL, I'd suggest an X2 BIOS, unless were talkin 1.6 or 1.6b systems, then u have some time 2 wait for support in the X2 Line of BIOS.
I suggest the X2.6 as it works on all versions, and gives the user the choice for an easy upgrade in the future 2 the X3 chip if they want, just pull it off the Pin-header and unplug the few wires, plug them into the X3 and put it back on the LPC, Change the Switches and your all done. plus since it has a Hardware disable switch the users can diside if they still wish 2 use XBL on that system, just as long as they don't do HDD upgrades...