Glider computers - what's important?

I have a datalogger, I have an IPAQ, and I have all the cabling etc.
I have spent considerable time at Cumulus Soaring, reading the
comparisons of glider software. What I lack is the experience to know
what is important. I've played with the features of SeeYou Mobile,
and frankly, most of the high end graphics stuff on the map just makes
it hard to read.
Many of you on this list have flown with this stuff, and done some
sorting out. I tend toward simpler and easier to use, rather than
bleeding edge, "every bit of information you could possibly want"
tools.
The only thing that is a go-nogo for me is a graphical display of
landing areas within glide under current conditions - a feature most,
if not all, seem to have.
Oh, another factor: a friend purchased WinPilot, SeeYou, and
StrePla. He's become used to WinPilot, and has offered to GIVE me
StrePla. Can it be set up so "Even a Caveman" can use it?

Thanks,
Jim