Basically I have for a while been using wordpress but I find it sloppy and old.
I want something that's new, effective, secure, and flexible. IPS looks like it may be a good idea but IDK how it is for blogging TBH.
I honestly say make your own, that way you can have full control over it which makes it flexible to what you want. You literally just need a bit of PHP & MySQL for the initial functionality plus HTML & CSS to make it look extra fancy and you're set. You could also add a WYSIWYG plugin like https://www.tinymce.com/ - it's great for editing text on the fly in the browser (similar to what WordPress does) . I got sick of using WordPress myself, but don't get me wrong, it's still a fantastic tool; so I ended up making my own tool for blogging.
As @Mophead64 said writing your own definitely gives some advantages and it isn't necessarily that hard to do. I wrote mine in PHP using the CodeIgniter framework and it didn't take too long to get it setup initially but any framework that uses model-view-controller will vastly improve development time and make it easier add improvements in the future.
If you don't want build you own cms, some alternatives that others seem to like are Ghost and GetSimple.
I myself, I'm looking at some flat file cms and Nikola seem to be the most interesting.
However, I think you need to specify the specific functions (if want a database, comment system, what plugins you want, if there is preference in the programming language used, etc) that you want from the cms.
If I where to make my own it'll be in node.js but probably won't
There are some HTML 5 themes out there that are free and other that have a small one time fee. I highly recommend taking a gander (I think themeforest is a market for that).