I had a thing for pens long before I fell into adult coloring.  For the record, I buy my own and take them to work because I don't think my employer should have to fund my pen fetishes.  

I've used the ones you have above.  Actually I might have a few strays running about.  I think I drifted away from them because they at times leaked.  Or found something I like better.  

I too am a fan of multiple (happy) colors in pens.  Mainly because as a writer who does still like to print and hand mark manuscripts I don't like black (blends in with the print), red (teachers, and it looks like you bled all over the page) or blue (too many other people use blue).  

I prefer at the moment Uni-ball Micro Vision Elite .5mm  Mine has a black barrel.  There are some wiht a white barrel that I think aren't as fine.  Granted, I use these for ordinary work purposes (and the package I am looking at is for black pens - which I use as a bean counter) but I think they come in multiple colors other than black/blue/red.  Smooth writing.  Fine enough for me.  disclaimer - I found the package at home not long ago when my work pen ran out so I don't know who long ago I bought this pack.  It's been a while - and I tend to buy a couple of packs of my favorite pens when I find something I like.

Not sure if this helps or not.  

I have a couple suggestions for you.   I really like the Pilot Frixon pens: http://www.amazon.com/Pilot-FriXion-Pencil-Ballpoint-LFP-312FN-24C/dp/B003R7ZVF2/ref=sr_1_6?s=office-products&ie=UTF8&qid=1454088559&sr=1-6&keywords=frixion

That particular set is not the ultra-fine point, but I see they have this set that is ultra-fine: http://www.amazon.com/Pilot-Retractable-Erasable-Komainu-Dou-Original/dp/B00R6L6ASC/ref=sr_1_9?s=office-products&ie=UTF8&qid=1454088559&sr=1-9&keywords=frixion

While they are called gel pens, I do not consider them gel pens, per se.  They are very smooth and come in 24 colors, IIRC.  There is quite a bit of variety in the set I have.

If you are not worried about bleed through, the ultra fine sharpies or bic permanent markers are both good as well, but they absolutely will bleed through.  Both sets come in up to 36 colors, IIRC.

This is also a really fine point set with a lot of variety, but you may have to worry about bleed through if you aren't careful: http://www.amazon.com/Stabilo-8830-2-Point-Color-Wallet/dp/B00ATBRJRC/ref=sr_1_1?s=arts-crafts&ie=UTF8&qid=1454088996&sr=1-1&keywords=stabilo

I hope that helps  

I bow to the superior knowledge of Curious on the topic of pens, but I almost suggested the FriXion pens earlier.  I use them for quilting and other things.  You can mark up your fabric and for the most part the ink irons off (some say it returns if you use the quilt in the very cold outdoors or if you put it in the freezer, others say that isn't true).  One thing I do know - if you mark up your fabric and then decide it needs a quick press before you sew - you are as silly as I am.  If you do that several times without learning anything by it, message me and we can talk about this embarrassing frustration in private