My money would definitely be on an HP2 unit, given the amount of time that Upman has spent on various firmware betas being tested on the HP1. The HP2 would most likely have built-in GPS along with the ability to decode one or two newer digital systems. And of course, the programming would likely be expanded to include features now found on the 436 and 536 series, such as "priority" functions and several other goodies. Additionally, the HP2 touchscreen, equal to or better than the HP1 display, could easily handle the analyze function. Sad to say that I do not believe 536 users will see the analyze function until the SIREN function is up and running--- I must agree with many of the posters on this forum that it is difficult to imagine how the display of all that analyze information available on the HP1 could be handled on the native 536 display.