PDA GPS: Anywhere Map vs. NavGPS Pro vs ??

OK, y'all are probably getting sick of all my GPS questions these days but
I'll go to the well one more time.

I may or may not get a panel-mount IFR GPS for my 172, that's a separate
issue. Decided I want a portable GPS to use as a backup and for sit.
awareness in IMC. Also decided I want something with terrain, since that's
one of the most popular ways to buy the farm and increased terrain-awareness
can't hurt.

Now, it seems like the Anywhere Map offers a better feature set than the
Garmin 296, plus the ability to upgrade to approach plates or XM weather,
all at a significantly lower price. Plus I get a shiny new PDA, which I can
write off as a business expense.

However, I have also looked at the NavGPS Pro system, and I like the fact
that you can enter IFR flight plans into it just like you file them, like
"BOSOX V1 GRAYM GON." I fly in the Northeast where "Direct" is unheard of
and being able to easily enter and update full-route clearances would IMHO
be a big benefit. Does Anywhere Map offer this also?

Another thing that I frankly like about many of the PDA-based systems is
that they don't seem to be designed by lawyers as much as the handhelds are.
Seems to me the handhelds all cripple their instrument approach
functionality to discourage you from using them to do actual approaches. Lot
of good that will do me when my electrical system s---s the bed. Am I
missing something here?

-cwk.