Your situation isnt a million miles away from mine. Think long and hard about it, whilst you obviously dont have a lions mane you still have plenty up there, if your maintaining on finasteride then your loss situation is far from out of the ordinary.
I personally have decided against a hair transplant at this time as basically, people like ours hair isnt really that bad, secondly its a lifetime commitment and thirdly, ive started to realise that its alright to be receding as you go into your 30s. of course, thats just me.
Whilst it would be nice to have more please bare in mind it comes with costs. To begin with you risk losing your native hair to shockloss, secondly you will likely need to top up your hair with further hair transplants own the line. Then you have to decide Fue vs fut as well. You are in a good position now, take your time, seriously think everything over and make an informed decision. However if you do go ahead, rahal is very good. Someone like him would probably recommend 2000-2500 grafts, more or less depending on how aggressive/conservative you want to go, price depends on fue or fut etc but you will pay a large premium for fue, however for your amount of loss, is it worth getting a strip scar?. Either way contact them for a free consult, they are very efficient there and one of the most helpful clinics i was in contact with. also check out the hair restoration network website for further advice and to see lots of results of other drs in your area whom you may like to consult with. all the best