1BLINDREF covered it well. If you pick up a P6, Top Gun Supply should be your next stop. They have what you need and at reasonable prices and great service.
I would also recommend you pick up one of the armorer's CD's from them. Its well worth the $21 they get for it. It shows you how to detail strip and reassemble most all the SIG's and is very easy to follow.
I recently picked a P6 up from Ganders for $350. You get the gun, two mags, and a holster.
They had guns with both the heel mag release and the button type mag releases. They do come both ways, so pay attention when you look. I got the pick of three guns they had left with the button release.
I've seen them anywhere from great to piss poor finish wise. If your worried about it, I wouldnt buy it over the web unless you get good pics of the exact gun.
My DA trigger was very heavy, about twice that of my other SIG's. I picked up a P225 parts kit, and a P225 hammer spring (its actually called a mainspring), and a couple of mag springs from Top Gun Supply.
The mainspring brought the DA trigger down to what my other SIG's triggers are like. Its a $4 fix, $25 if you buy the CD so you know how to get it in.
I also picked up a set of Meprolight night sights for it. The P6 comes with a set of plain, black sights, or at least mine did. I have the sight tool, and it too is well worth the money, especially if you have a bunch of SIG's. It will remove and install sights as well as adjust them. I've replaced the night sights on a couple of used guns I have, and sold each set of the ones I took off on EBay for about half the price of a new set. That right there paid for the tool.
Now that I went through all that, I'm willing to bet I probably could have picked up a P225 in better shape for about what I now have into the P6. You may want to look around and see before you buy, unless your happy with the P6 as it comes. You can also probably find a CPO P226 or P229 for about the same money, and have a high cap gun in a hotter caliber to boot.
My P6 shoots well and seems to feed hollow points just fine. I do seem to have a problem with my thumb hitting the slide stop while shooting, allowing the slide to go forward on an empty mag. I shoot "thumbs forward", and so far this is the only SIG I have that I've had the problem with. I think is due to the grip being thiner than the rest and my thumb ends up closer to the stop.