'What do you think of the lens choices?' It looks like you're missing something longer in your lens selections... Say a zoom that'll get you to 200mm or 300mm... Just something to consider. Obviously I don't really know what you plan on shooting so you may be fine, but I didn't think I'd ever have a use for a 70-200mm lens ('cause I'm a portrait photographer... Why would I ever need to go above 100mm?!?) until I used a 70-200mm lens. Over the last 5 years the 70-200mm has been my primary 'money making' lens, and I'd estimate that it's on my camera for about 75% of my client work. Again, just something to consider...

Any wide angle lens you recommend? It looks like you've already got a wide angle you're thinking about in the 17-70mm Sigma, unless you're looking to go fisheye, or you really want a prime.

Is it a 'smart move' to consider 3rd party lenses? In general, as long as you stick with the 'major' third-party brands (e.g. not grabbing some no-name lens on a rock-bottom discount on eBay) you'll at least be able to find lots of in-depth reviews on most lenses and brands available so you can evaluate your options with lots (usually lots and lots) of detail so you can make informed and objective decisions.

Despite what some people will tell you not all 3rd party lenses suck (and of course the notion that all 3rd party lenses suck is generally perpetuated by the 'name brand' camera manufacturers, so you'll tend hear that 'fact' a lot). In fact 3rd party lenses have made major strides over the last decade and there are far more good 3rd party options than there used to be. There was a time not too long ago that all the 3rd party options were sub-par by comparison to their name-brand counterparts, but not any longer... The only reasons you might specifically want to stick with 'name-brand' are:

• If the name brand lens is a 'class leader.' No point in buying a 3rd party lens that can't compete with the brand name purely because of the price. That's penny-wise and pound-foolish. In the long run it's far better to save into a lens, buy a well cared for used lens, or wait for its price to come down a bit, then to buy the cheaper but lower quality lens.
• In general, name-brand lenses hold their resale values better than their 3rd party counterparts. I've had several brand name lenses over the last decade that I've sold at or close to what I paid for them, but the same can't be said for the 3rd party lenses I've sold over the years, all of which have gone down in value, most of them relatively sharply. Depending on what kind of shooter you are, you may never sell lenses you buy, in which case brand-name doesn't matter nearly as much.