In reply to climb the peak:
As a Valley veteran my suggestion for buying gear would be to order online in the US and get it delivered to the post office in Yosemite Village. This is much cheaper than buying in the over-priced mountain shop and guarantees you don't get caught out by something being out of stock - they didn't have a single peg hammer when we'd only brought one by accident a couple of years ago, we had to blag one of a helpful guy on the YOSAR site.
For big-wall specific gear (haul bag, ledge, aiders...) I'd really recommend Fish products
http://www.fishproducts.com/ who pretty much only operate by delivery. Also a +1 for REI.
Another weight saving tip is to buy cheap stuff (eg a tent) on eBay or Amazon, get it delivered, and then sell it via the camp 4 notice board (otherwise you still have a problem with luggage allowance getting home!)
A couple of handy tips to avoid pitfalls with this plan. There are about half a dozen places that could receive mail in the Valley - make sure you get the address right! And remember the post office is closed on Sunday - we got caught out flying in over the weekend and hoping to jump straight onto Sunkist but had to wait to collect the Blue BigBro on Monday morning (luckily, as the off width chimney would be horrendous without!)
Have a great trip! Can't make it this year
Cheers, Dom