ok well some of this may have been answered but hey: i like to put things in my own words
1'st
install without touching mbr? easy.
any distro should ask where to install/ if to install grub; usually in an advanced tab. you simply have to install grub to the same partition as / partition or dont install it at all and use another distro (liveusb livecd) to install it.
then use easybcd to point windows bootloader to it!
this is exactly what i always do and i never have any problems with it
2nd
ok: distro's that 'just work' are something i used to want (tricky wifi on my laptop) and the best ones are superOS (ubuntu with some goodies) pardus (dont be scared by the turkish website: there is an english option and the OS is english too) pinguyOS (another ubuntu knockoff).
i am also told that PClinuxOS is fantastic for easy install/use, but i've never used it myself
good luck!