What models of routers on the Moscow market are suitable for DD-wrt firmware and for my requirements?

Question

network hardware

Please help me choose a router to buy it in Moscow in the coming days for the purpose of subsequent DD-Wrt firmware.
I bought a Chinese router on aliexpress using the keywords "DD-wrt", and it was a mistake - there are no jffs on the router, and I didn’t get anything from the pre-installed DDwrt (on aliexpress, despite the fact that there are a lot of interesting things there, such - mismatch of real characteristics with those that are intuitively expected happens often.Although the router cost 600r, so it's not a pity), there is no time to wait a month for a new order attempt there, or on Amazon, now there is no.
I don’t follow the router market, I don’t understand the lines at all, that’s why I ask for help. My requirements:
1) not very expensive
2) full support for DDwrt (not necessarily official, from the manufacturer, community support is OK)
3) so that you can enable jffs - as far as I understand, the SD card must be connected, right? I will put a large number of python scripts on the router, so a ROM with not the smallest volume (not a couple of megabytes) is very desirable.
4) since such a dance has begun, and I buy a new router, let it be possible to use it in 4G networks - or something built-in (is it more expensive, probably?), Or just a USB port to plug in an LTE modem
5) to There are no special requirements for WiFi, although support for n and higher signal strength would be a plus if they do not increase the price of the router very much
6) and gigabit ports for LAN, built-in switch, will not inflate the price? Or at least two gigabit ports? Two others will arrange 100 megabits. But this is optional. In principle, it is even possible that the router has only two LAN / WAN 100 megabit ports, if this greatly lowers the price - then I'll just buy a new 1 GB switch, although it would be better to have 4 ethernet ports, since I wanted to do something with VLAN' ami (separate the same IP-telephony), and on DDwrt VLANs are just supported, but on cheap gigabit switches they are no longer there.
The question is about the model - I ask for help to suggest and name the models, since, unfortunately, I do not have enough time to read dozens of reviews and scrupulously compare hundreds of models on the Yandex market.

Answer 1

Expensive, but cool for iron.
Asus RT-AC56U
Asus RT-AC87U
$75 - There is an awesome powerful ASUS RT-N18U - 800MHz; RAM - 256MiB; ROM - 128MiB; USB 3.0, but have not yet stuck Wi-Fi under OpenWRT. :(
You can commit sacrilege and reflash MikroTik to OpenWRT. The bottom line is that Mikrotik has a polished iron base.
Or leave RouterOS and use MetaRouter into which you can load a virtual OpenWRT. But most likely everything will move weakly.
$ 60 - Mikrotik RouterBoard RB951Ui- TP-Link TL -
WR1043ND v2 - 720MHz ,
64MB
Pay attention to revisions. It happens that they differ significantly in iron.
For the final decision, you may find it useful - https://wikidevi.com/wiki/Main_Page
DD-WRT Supported Devices
OpenWRT Table of Hardware