I would say the Etymotics series of iems is a great start. If you want the most bass from an Ety, the ER2XR has the most bass amount as well as best natural sound as it uses a dynamic driver. The BA series (ER3/ER4) are better for resolution and slightly more treble extension.
I think the ER2XR is closer to the majority of IEM flavors out there in terms of it’s sound signature, but still falls short of being considered V-shaped to me, but it does have good bass extension.
If the super resolution and deep fit is concerning, and you’re sticking to that budget, there’s a few other options I like:
Sony XBA-N3 – single dynamic driver. Very nice mid-range. It’s got a bit of a bass boost though, which I do not like, but very natural mid-range and laid back treble response.
Dunu DK2001 - A very well built slightly V-shaped IEM that comes with a very nice cable. I wrote a review of it recently on my site: https://www.antdroid.net/2020/03/dunu-dk2001-review.html
Moondrop Blessing 2 - I’m currently listening to this one now. Purchased it very recently. It’s got kind of a big bore diameter though and does affect me with smaller ear canal size. Otherwise, the tuning is really ideal for me. Gentle bass boost with a flat mid-range response and pinna gain that isn’t overly harsh and even treble response. This doesnt necessarily have a big amount of slam but does have good extension.
Moondrop Starfield - $109 with similar tuning to Blessing 2 but with only a single dynamic driver instead of DD + 4 BA, so a bit less resolution, but fit should be better.
I’ll have to think about this a little more. Perhaps @toranku or @darmanastartes or @Titienne can help me here.