If you're gonna ski 60/40 park I'd go with Blends. I own both.. so I can talk here. But it just depends on what flex you like. I like soft skis, but my blends are still dope as hell. My anthems are fun too.. however they aren't great for steep/choppy/pow. Blends just kill it everywhere.
As everyone has mentioned.. anthems are stiffer than invaders.. but not too noticeably.. I had invaders this year too. They definitely feel more stable though.. attributed to the extra width of course.
One thing to note is that both invaders and anthems will come with a carbon ollie band next year.. it may change the flex ever so slightly.. but look for some added pop.
I don't work @ jibij, but you should go there!!
'Heh Heh ... All Right.' ~Quagmire