Shai
Uhmm let's see. If you are planning to make a half donor harlequin based on your remaining RPs, I think that your HoP will reach around 250 M - 300 M--with couple and stuff. And considering that you will buy Aurum Set first. I mean I saw a non-donor harlequin did a 200 M+ HoP on me and her gears were as follows: Kalgas Set (2 parts +800 str awake); Shadow Yoyo and Holy Shield (both +800 STR awake); 40 RP mask and cloak; Attack Accessories; RC Fashion; and Perfect Tiger. Oh and premium status as well. I think it was around 205 - 210 M if I'm not mistaken. I'm pretty sure that she doesn't have a level 21 couple.
If you were to compare it to a non-donor FM, your Asal should reach up to approximately 500 M. I'm not sure though. But Asal should be a lot stronger.
About your question, I'll use the cliche again, choose a job you are most comfortable with. RP-wise, I think they are both the same, if not close. Or FM should be a little more expensive. If I were to choose, I'd go with FM only because I really don't know how to play YJ. I think I suck at it. I'm more comfortable with playing FM. Or Arcanist. Nevertheless, if I were to put myself in your own shoes, I'd go for Harlequin. Why? Cos it has Dark Illusion and Counter. If you are planning to fight non-donors as well, then go for Harlequin. But if you are planning to siege, then go for FM because I really think that a non-donor HoP will have a hard time killing siegers compared to a non-donor Asal. Though Harlequin should have a better chance of surviving.
EDIT: I didn't see the items you posted because I'm still thinking what to reply. But taking the items you listed into consideration, you'll probably have at least 350 M HoP. Because I think a FD HoP without buffs and using PvP shield is somewhere around 570 M - 580 M. That's with couple and everything. Oh but STA colosseum potions I guess. At least that's what I had on my previous Harlequin.