Having moved from ironman-d tri to ultra in the previous 12 months I was hoping to be able to train and rock up to events without the worry about specialist gear, and lots of it! How wrong was I.....it's just as bad and I'm still filling the car up 
Anyway, still finding my way but picked up some decent gear and advice. I guess I should point out I'm quite competitive
so I take practicalities and weight quite seriously in prep for events.
I'm a big fan of inov8. I am now on my second pair of roclite 295s and have no reason to ever switch. Plenty of room for the wider foot or swelling, removes moisture well, and yet to have any major blisters. I train with a inov-8 elite backpack but now race with a raidlite olmo5(ltr) backpack. I love thr front facing bottle system. A little shoulder and upper back ache at the end of the more hilly races but its great if you race with limited gear.
I'm a fan of compression so will use 2XU calf guards and shorts (I prefer this to the full length as makes me feel a little less constricted around the knee (marginal, or arguably mental). Still on the lookout for a decent top as I use HH. But may check out Olmo for the colder weather running.
Waterproofs - I guess 200g is a decent weight to aim for if you're looking to keep weight down.I bought a great OMM smock from Likeys end last year which is taped and does the trick but more shower proof than waterproof. I recently invested in a Berghaus gore-tex paclite shell (sale at cotswolds still) which was supposed to be for warmer weather trekking. It's a little heavier than the OMM nut I'm wondering if it would be better to race with.
Anyone have any thoughts on harder wearing (but light) breathable+waterproof shells designed for hiking being used in ultra racing?