As a (proud?) owner of so many Raspberry Pi I don't know exactly how many I've got (I think seven, I started before they really were a thing). What'd be the ch

As a (proud?) owner of so many Raspberry Pi I don't know exactly how many I've got (I think seven, I started before they really were a thing). What'd be the cheaper and better boards, easily available? (I'm in the EU FWIW) For some stuff I know I'll have to stick with a Pi (for example in the arcade cab I've got a Pi2JAMMA adapter and I don't need that necessarily). What have you got? Beagleboard? What would you recommend? (I don't have any special ties to the Pis)