Get a Scanner unless you want to be bogged down by power packs, bluetooth keyboards/mice & touchscreens & stylus..
Pi's are great, Ive got 2, for TCP SDR & a STRATUX station...But they are far from convenient & no where
near entry level user friendly, even if you know Linux..Alot of code to write to get the parts to play nice together..
Get a SCANNER..Unidens are my Fav after GRE closed down..the 396XT is fantastic. Receives awesome, Portable & small...Truely Pocket sized. A BOATLOAD of memory..
Dont pay more than 200-225$ for a PreOwned...Be Patient & Search EBAY..A buynow will pop up and you can score a great deal..
Get the ARCXT Software,,itsalso very good, even better if you can navigate MS/Excel...