EMAX Tinyhawk 2 Freestyle BNF 2.5 Inch FRSKY FPV Drone 2s 200mw VTX 7000KV RunCam Nano2

I have used the following brands over the years: SpeedyBee, JHEMCU, HIFIONRC, GEPRC, iFlight and BetaFPV. Of these brands, I have used more JHEMCU boards than any other. I really like the HIFIONRC boards, but lately, I have not seen them. I have used several GEPRC and BetaFPV boards with no issues. Darwin is generally cheap, but I have moved up from boards with an F411 to boards with at least an F405. Since you mentioned using 3S batteries, you will need a board that supports 3S input voltage. Either something like a 1S-3S (DarwinFPV = F411 15A), a 2S-4S, 2S-6S (NewBeeDrone), or a 3S-6S (most boards). You are likely looking for a 25.5 x 25.5 diagonal oriented whoop/toothpick board. I would consider the following JHEMCU board. It seems to fit what you want. Yes, it might be a bit more than you need, but it will still work and the form factor (size) is not any larger than any other whoop board. Yes, it will fit. This board will work, plus, it is plenty sufficient to be used in a larger build later should you go in that direction. I buy boards like this just to keep in the parts bin because these will work with any quad that I would build from a tiny whoop to a 5-inch (sub-250-gram). JHEMCU GHF405 PRO Bluejay 40A 3-6S AIO Whoop Flight Controller $86.99 — Pyrodrone This is likely about as good as it gets right now. AIO boards are going from about $70 to $100++ USD. Even the more or less junk boards cost quite a bit. I have looked through my top 4 source vendors (PyroDrone, RDQ, GetFPV, and Amazon), and this one is the best one that I could find. The one that I would most likely consider. There are very few boards less than $60 USD that support 3S and have at least an F405 chip. I am currently running this stack in two of my aluminum framed, 3-inch, builds. Yes, at $125.99 USD they are likely more than you want to pay. Still, they have been rock-solid so far. I also have the AIO boards. Yeah, I bought a bunch of back when they were about $70 USD. I think those days are gone. Amazon.com: SpeedyBee F405 Mini Flight Controller Stack, 20x20mm, APP Control, Bluetooth Built-in, 35A 4-in-1 BLHeliS ESC Board. Yes, you could buy a "cheap", knock off or lesser known, brand. Sometimes, you get what you pay for. I have considered this; however, I have about a dozen FC products in the parts bin, so I don't need anything just yet. Well, I also have dozens of builds that I could break down for parts. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~// Just a consideration = Now, here is another consideration that I am going to throw out there. See what you can find in a BNF quad. Yes, this sounds a bit crazy but is it. I once picked up a $70 USD BNF just for the parts. It is still in the parts bin. Ok, I might fly it some before dismantling it. Damn! I just found this on Amazon for $119.99. I have two of them and they are really nice little quads for smaller spaces. Well, even up to about 1.5K (maybe more). For this price, I can't build one. Yes, it is not what you are looking for, however, it serves as an example. Hmm. I might keep an eye on this one, maybe order one. Amazon.com: EMAX Tinyhawk 2 Freestyle BNF 2.5 Inch FRSKY FPV Drone 2s 200mw VTX 7000KV RunCam Nano2