I was all ready to order a (wildly popular) Garmin 530 upgrade but now I =
have read that these units are not WAAS capable and will need a =
motherboard upgrade whenever they develop a WAAS capability, since there =
are fundamental problems with the basic refresh rate - see this months =
Aviation Safety.
WAAS is very important, needless to say, since it increases the accuracy =
a lot, and it could save your life. Ironically, the lowly Garmin GPS =
295 portable/handheld is WAAS enabled!
At this point, I predict sales of the Garmin 430/530 will deteriorate =
until they get WAAS.
I'm waiting.

Just buy the UPSAT all in one, it has everything you want and need.
Much nicer interface, too.