hp1 has been discontinued a few years., HP2 is current and phase II capable as all the current Unidens are. Dont get a whistler brand, they do lousy in simulcast(multi-tower) areas your in.
Uniden only way to go in your situation and all are phase II capable. When we have met at the airshows I have the discontinued 396XT and decoded the 911 fine.
See -
WS1040/WS1065 vs Simulcast 800
Unidens lowest - highest $: 325P2(one thats like what I have) , hp2, 436hp, sds100 are the portables since Im sure what you want.
325p2 has to programmed, I find they are better for someone like I who wants to put program them myself and easily able to input any frequencies you want and I have one of the 100 available quickkey(bank) for airshows
, the other two have sd cards and you input your zipcode to program them. Every so often even then just like 325p2 the 436, hp2, sds 100 need to be updated with a windows pc running sentinel to update the database in it and any firmware updates from Uniden.