"""let me know any info or knowledge you might have or maybe even any comments or thoughts on this..."""
So sorry to be completely unhelpful.
However, I am going to help you anyway.
The newer Mesa 410 has great low end, wonderful midrange content, growl, clear high end and so on. I used to own two of these cabs and they were loud and wonderful. No complaints.
I am not a fan of the Markbass heads - there seems to be a loss string detail between 800hz and 2khz. The edgy pick tone seems to vanish with these heads and I do not quite get it. This might be due to my Spector Euro basses, but I have been able to get it out of my Carvin BX1200 heads and GK heads. Markbass heads overall have a great presence in the lows and low mids, but I am not quite sure what else they can really do. The SD 1200 is a CRAZY loud head and you need to watch the volume levels.
The comment about the headroom of the cabinet is not quite on track..... You can easily kill the cab with the head, however, there is no need for a limiter here. Just listen to the speaker - farting/flapping distorting sounds are BAD news. Reduce low end content and/or volume to remedy.
I highly suggest ordering some gear online through musiciansfriend.com and taking advantage of the 45 day trial period. The Mesa 410 is a GREAT choice. The cab weighs 92 lbs - keep that in mind. Markbass heads have a unique tone to them - search the used ads or find another bass player on here who uses the same gear. A simple meet up can tell you everything you need to know about the head.