There is many choices of cr and sizes available for wossner, supertech, je, accralite to name a few. I prefer some over others for various reasons.

I would go for a slightly lower cr using the mfi setup or if you planned to change management systems in the future then maybe different again.

So really it comes down to your final goal you want to achieve.
If you build this nice forged emgine its a waste on mfi.