Can someone recommend my first RTA please?

[Astral]

If you're using 0.3ohm coils it look like you're looking for a DTL RTA rather than MTL, and from that perspective I'd happily recommend the @dovpo_uk Bloto V1.5 to you (if the Bloto max is a little big) and the OXVA Arbiter 2. They're both terrific tanks; both child's play to coil and wick, perform brilliantly and don't leak. You can't go wrong with either.

Another couple to mention might be Kylin Mini and Mike Vapes Eclipse. I haven't tried either, so I can't vouch for them, but they both have plenty of fans on here.

Good luck.

 

[Biochemist]

The standard by which I judge just about every tank is my Taifun GT3, but I don't even know if clones of it exist anymore.