I keep thinking about the mini v3 but I'm not sure I'll be able to build any proper coil on it. The deck seems much smaller on the v3m. Like even on the KF5, I'm having a bad time going over 26 awg wire, I've tried 28ga Kanthal A1 and 32ga SS. On the ss one that I'd built I already started freaking out because my resistance was jumping from 1.4 to 2 constantly. I get this even on the 28ga Kanthal, resistance slightly jumps by a decimal margin (like from 1.2 to 1.5, in any case, lesser than on SS wire). I've been using the KF5 for a while but for some reason, it seems that I have to change the wick like daily, sometimes even twice a day. This has started occurring ever since I'd added the airflow screws, coil span and wick seemed fine even for a whole week when I was building under 1 ohm. This might actually be a bit offtopic, sorry! I will edit it out if it's inappropriate.
Oh, about the Siren, I thought it's pretty good, just that it resembles the stock KF5 afc, which was a bit too airy for me; as for the Cthulhu, I wish they'd made a slightly smaller one honestly (sadly my mod's diameter is 22mm
). That's why I thought the Skyline might be a great alternative, deck also seems to mount coils easily, but it's at about 200 eur with the shipping so tough luck.
It might sound silly but I'm actually afraid of getting tanks from FT because I have no experience with important parts like o-rings, screws, insulators etc. It might be overboard but after reading about a few cases about PEEK insulators melting I just thought I'd rather avoid that. I'm generally clueless about this stuff, I just followed the KISS rule (keep it simple, stupid) and read guides for everything so far.