Thank you jarda for your help. 
The thread you have found are relative to 2 WAN and 2 LAN, but while the environment is the same, the problems are different.
2 LAN, 2 WAN, no fixed computers paths, the problem is external port NAT redirect.
http://forum.mikrotik.com/t/routing-2-wans-and-2-lans/109661/1
2 LAN, 2 WAN, no fixed computers paths, the problem was redirecting all LAN1 to WAN1 and all LAN2 to WAN2.
http://forum.mikrotik.com/t/dual-wan-in-dual-lan-out/101632/1
2 LAN, 2 WAN, no fixed computers paths, the problem is like the previous.
http://forum.mikrotik.com/t/dual-wan-dual-lan-setup/118588/1
2 LAN, 2 WAN, no fixed computers paths, the problem is to make 2 bridges working AFAIK.
Probably as BartoszP is worried, I’m not smart enough to make simple queries, however I’ll try again with a graphic, maybe I can express myself in a better way using an image. 
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I would like to instruct the router to permanently route PC2 in LAN1 and PC12 in LAN2 to always use Router2 and all other boxes to always use Router1.
Since there is only Router6 connected to the PCs I cannot use the “route” command on the PC and the “route” command in the routers I’ve used only change path based on destination, not source.
Is this different in MT routers? Can I change the route based on the source instead of the destination?
A1. Yes.
A2. Yes. And by winbox too.
A3. All of them. Just take care about the cpu performance, it is not clear what throughput under what conditions do you expect. I would choose hap ac2 from your list. Compare the performance and block diagrams.
I see you are smarter than me! You already guessed my next question.
Yes, all of them are good routers, but how heavy is the load for the CPU/RAM with the extra route rules (or whatever is needed)?
CRS109-8G-1S-2HnD-IN
8x 1Gbps usable (very nice!), throughput barely enough (less than 700/1000Mbps will it be enough with the routing?) but no 803ac.
hAP ac²
Impressive throughput with big packets (1.9 Gbps), but I see it is quite hot, maybe not the right choice.
RB2011UiAS-2HnD-IN
5x 1Gbps usable, 5 100Mbps “wasted”, nice throughput 700/1200Mbps (will it be enough with the routing?), but no 803ac.
CRS125-24G-1S-2HnD-IN
24x 1Gbps usable (great!!), throughput barely enough (less than 700/1000Mbps will it be enough with the routing?) but no 803ac.
A friend of mine said MikroTik routers can also run as firewalls and are much more configurable than any others.
That’s why before buying a router I’ve decided to search from all them in the MikroTik site, found the ones that are fast enough (in theory) with enough ports and possibly with wifi.
