Re: kestrel weather meter
Definitely get everything you need from a 4500.
That said, I run a 2500 in conjunction with a FDAC(field density altitude compensator). Since I shoot 175/8 308, the FDAC is my dope card, and it has a DA graph right on it. I calc my DA, slide the card, and there is my firing solution. Like frickin magic, the FDAC has been very accurate and I keep my gadgets to a min.
Even without the FDAC one can find a DA graph online.
Maybe not the perfect solution for everyone, but works for me.