I'd say it depends on a few things, like whether you want a shooty or fighty list, whether you like big steady units or a pick and mix of different stuff - I like the latter so I play wracks as troops and a couple of three man (sorry True Eldar) Trueborn AT squads with DLs and blasters plus either wyches or kabalites (rarely both) and hellions 'cos I luv 'em. A venom or two is naturally great for chewing up infantry.
But in truth there is nothing wrong with the list you've designed if it suits the way you want to play so go forth and mutilate.
When my cats aren't happy, I'm not happy. Not because I care about their mood but because I know they're just sitting there thinking up ways to get even.