For my purposes (90% of my listening is digital audio logging for later playback), the digital scanner was a waste of money, and the ARD25 was well worth the $400.
I first tried a BC796D with Trunkstar software (
www.scanstar.com). Even with the squelch at full, I wound up with a digital audio file full of false squelch openings on multiple conventional frequencies. Completely useless. Adding an external preselector (Optoelectronics APS104) didn't even help. Now it all gathers dust.
The next system I put together consisted of an AR3000A, ARD25, and scanrec.exe. For trunking I add an Optocom and a Pentium I running trunker, though most of what I am interested in is conventional 162-174 MHz. This combo works very well.