Denon And Marantz are the same company. Like Chevy to Buick.The .2 simply means you don't have to buy an RCA splitter if you use two subs. There are AVR with separate sub control...but those are all $2000 and up.
The 2313 "is" the Marantz I linked(the main difference between Denon to Marantz is the inclusion of pre-outs and in higher models 12v triggers where the Denon doesn't include it).
Nobody will argue "against" a Yamaha RX-A anything.
However...AVR choice boils down to your needs/wants and...
Your future idea of "wireless rear" and "$300 budget for AVR" do not work together.
Here is the cheapest AVR with pre-outs(and the cheapest place to get it "new"...and with an aftermarket warranty if you ever desire)...