Cartridge upgrade?

I haven't seen a lot of people post about owning either of those cartridges, so your chances of hearing someone's impressions of both are probably slim.  

Here are some things to consider.  Your turntable is probably the weak link in your analog chain, not your cartridge (IMHO).  The Hana SL is very nice and you have an excellent phono stage from everything I have heard about it.  I own Herron monoblock amplifiers and they are spectacular. 

The Concept is a decent turntable, but that magnetic tonearm isn't something I'm crazy about and I don't think the table itself is very well isolated.  I owned one briefly, so I'm speaking from personal experience.

I have the Kiseki Blue NS, the cartridge below the Purpleheart.  The Kiseki Blue is better than the SL, a little more airy and detailed, but not by a huge margin.  I have heard of some Purpleheart owners mentioning quality issues.  I suggest doing a search on that.  

Putting an expensive cartridge on an entry level turntable isn't necessarily a bad thing.  I currently have my Kiseki Blue NS on my Technics SL 1200 MK 2 and it sounds really good. 

I have a recently retipped Zu Audio Denon DL-103 (which I think was about $400 new?) on my Acoustic Signature Wow XL and that combination sounds better than the much more expensive Kiseki Blue on the Technics.  The Kiseki Blue didn't significantly outclass the Zu DL-103 when I had it on the Wow XL, but it was definitely more refined and clearly better than the Zu on the Wow XL.

In short, my experience has been that upgrading the turntable provides more improvement than upgrading the cartridge.  They both matter, but my experience has been that putting a really nice cartridge on a less than solid platform (table and tonearm) is going to result in less of a sonic improvement than putting a modest cartridge on a well engineered turntable and tonearm.

am I going overkill with a $3-4k cartridge given my tone arm/tt?

Possibly

I’m pretty happy with the sound I’m getting currently but want to stay away from a cartridge that’s too forward sounding. I love the high end detail I’m getting from the diamond tweeters of my B&W 805d3’s but feel it can get a little bright at times.

The Kiseki is much smoother than the Hana cartridges, but from my personal experience they are not particularly resolving given the price.

I would have a look at the Soundsmith range - the Soundsmith MI cartridges are incredibly smooth and resolving - they should be a good match for the B&W's with the Diamond tweeters. You can select output and compliance to suit your arm and phono stage. Anything from US$2k should be an upgrade over the Hana.

You have a solid setup.

Consider putting the Audio Technica ART9 on your radar.
There are enough archived threads to give you an impression it has characteristics of the uber cart$.

Like big_greg, I have used the Kiseki Blue and it’s a wonderful cart, but it’s $2k+ and I used the ART9 before that. The ART9 is on level playing ground with the Blue for half the price-subjectively, of course.

Your phonostage will handle the lower output .2mv ART9,which may have a smidge more refinement over the .5mv model.

@dover Thanks. Yeah I’ll look into Soundsmith too