The cellular block is pretty useless these days as almost all cellular networks are operating in 100 percent digita mode now. Analog is used so rarely that the block is a non-issue as you're not going to hear much in the way of intelligible signals on the 800 cellular band anyway even with an unblocked scanner.
Which scanner to get? One that can scan everything, of course!
Most places you can go in America have one or more public safety organizations operating on a
trunked radio system which is most often in the 800 MHz band, but trunked systems do exist in the 900 MHz band, the UHF band, (450), and the VHF band (150). And in broad terms, these trunked systems are in either Motorola (Smartnet, Privacy Plus,SmartZone, and the digital Astro) formats, GE/Ericsson/Com-Net/MaCom (EDACS and ProVoice digital) format, or E.F. Johnson LTR format. All three families (Motorola, EDACS, and LTR) come in several variants including digital formats.
You want a scanner that can handle ALL of these, if you're going to be a serious scanner enthusiast.
Uniden's top models will do it.
You will need to learn a bit about how it all works. I recommend these sites:
www.batlabs.com for Motorola system education, and
www.radioreference.com for info on all brands and systems.
Yes, it can get pretty hairy. But when you understand it, it enhances your scanning.
CJ