just warning you in advance, there will be an OP on here who will recommend you get an HP1 and hook it to some tool belt or tape it to your wrist, or some nonsense and pretend it is an actual handheld. LOL. first off, he does NOT own the scanner he advises, just talk...
I suggest the 435HP, great scanner. if you only need phase 1, u can use the 396xt. i have two of those. small size, color screen, etc. but, if i had to own only one handheld, it would be the 436HP hands down. just my advice, others have their opinions also. there is a learning curve, but if you are new, there always is. having someone help you will make things easier, and YOUTUBE videos.