Lot of it depends on how much room you got. I didn't have room for a big screen unit up front, so I opted for two 7 inchers that are networked. Networking gives a lot of added options, especially Ethernet networked systems. Two 7s up front gives me more viewing options than one 12 and a lot less expensive. I have three gen 2 touch 7s networked on my boat and have more viewing options that a big screen tv.
3 x 7 = 21
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