@MrsWood - that is nice, detailed information. Thank you for taking the time to write all of that down. It helps a great deal in making recommendations to know what you like and what you don't like about equipment you own or have owned. I am so very sorry that you had that experience in trading. Some people are not trustworthy and take advantage of others. Sad but you learned a valuable lesson and you will end up with better equipment now.
I would recommend that you take a look at the Tesla Steampunk Nano 120 TC edition. It has some weight, yet is portable. The battery life is great. It does TC well. It is a rock solid mod and has an off/on switch, which is a bonus. I keep one of these on my counter (Copper) for testing DIY batches. I have given away two, a brass and a silver (SS), to two of my son's friends and they are head over heels in love with it. Some people complain that the battery door is loose, but I have never had my batteries fall out and neither have the two young men to whom I gave the mods. Fasttech has these mods for $38.77 but it will take at least two weeks (probably more) to get it from FT. Domestically, it can found for $49.99 at VapeWild.
Another workhorse mod that fills your requirements is the Smoant Battlestar. I like the shape of the Battlestar a bit more than the shape of Tesla, but that is a personal thing. I gave mine to my son and he loves it. It also has a great battery life, does TC well, and checks off all of your boxes. EightVape and ElementVape have the best prices I could find domestically - $39.95 at ElementVape and $36.99 to $49.99 at EightVape, depending on the color. I LOVE the Rainbow!
That is my two cents worth, based on mods I have used. There are many others that would work for you. I have no doubt you will be hearing about them from the other enablers here.
If you are looking for a tank that uses drop-in coils, the only one I have used lately is the FireLuke by Freemax, which I like very much. They come with two glass tanks, one hold 4ml and the bubble glass holds 5ml.
I use RTAs pretty much exclusively but other people will have suggestions for you. Good luck!