Which router to take with 2 WAN or how to make an MFP in two networks at once (WiFi and wired network)?

Question

network hardware

Let me describe the situation first.
There are two non-overlapping networks - office wired and WiFi. They do not overlap due to security reasons. I was given the task of buying an A3 color MFP so that at least both networks could print, and better, scan over the network too. Budget up to 200,000 rubles, and preferably up to 180,000 rubles.
At first I decided to look for an MFP like Kyocera 2551ci, into which you can insert additional. IB-51 module (WiFi network card). But the problem turned out to be not in the budget, but in the fact that so far no one (not the service, nor the suppliers) has been able to confirm to me that both network cards (wired built-in and additional WiFi) will make it possible to connect the MFP simultaneously to two networks. Therefore, I cannot go to the management and say - let's buy and there, along the course of the topic, we will figure out what and how.
Therefore, the solution of the issue, on a tip from another forum, spilled over into the search for a router with two WAN ports, one of which will be connected via WiFi to a wireless network, and the second WAN to a wired one. There will be an MFP as a client on the LAN port.
Question1: which router (preferably non-buggy) can suit me, in your opinion?
Question 2: what other solution of my problem seems to you more adequate than installing such a router?

Answer 1

Router - either an old one (for example, D-Link DIR-300 / NRU) with DD-WRT firmware, or a new Mikrotik RB951 for 2t.r.

Answer 2

Uh-huh... It's interesting how we lived before Mikrotik)) Apart from him, nothing crossed my mind either... I have a Mikrotik 951 at home. I thought, what else would it be - the light did not converge like a wedge on it. But no;)
Added on 07/13/2015: unfortunately, the version with Mikrotik did not work stably. Pings went, the press went, but somehow it was not stable. Suddenly the print hangs up to the loss of the print. I tried many different options for firewall settings, up to disabling filtering. A couple of tests will be missed - and silence. As a result, the most stable and currently working solution is the LAN MFP to one network and the USB port of the MFP through the print server to the wireless network.
With print servers, too, not everything is simple. Two were tested: TP-Link TL-WPS510U and the old D-Link DP-G321. So, the new TP-Link also hung up, did not skip printing photos and drawings, gave errors instead of print jobs. And the old D-Link "just works". No kidding.
Hope it helps somebody.