So, what you are looking for is an RDA.
As a good 'All round' take a look at the Dead Rabbit V2 @ £20 give or take. For a dual coil RDA.
If you are looking at single coil, look out for the Digiflavor Drop Solo @£20 ish
Arguably the best RDA of 2019-20 is the 30mm Vaperz Cloud Asgard. @£40-50. It has a 25mm baby bro @£30-40.
bargain buy atm. Is the Hellvape Reberth RDA. I've seen this @£8.99 and it's a stonking RDA.
I have to confess, my all time fave is the Drop, sadly out of production as they ceased being made last September, fasttech has a few left in black or blue...