You're looking at four very different operating systems. SA, SA/DA or DAO and Safe Action. Before making any decisions you need to choose the system that you like best.
What's the intended usage? Range, home defense or licensed carry?
I like DA/SA, and so for me the natural is the P228. SIG Sauers fit my hand best, balance like nothing else, and I'm much more accurate with them. I don't mind the extra weight and the extra care to prevent rust. In exchange I get superior accuracy and, at least in my experience, better reliability.
To me capacity is a moot point in the era of ten rounds Clinton mags. If you want to buy preban mags than a BHP and a P228 will take 13 rounds and a Glock 15. There are also preban mags with higher capacity mags that fit flush such as 15 rounds MecGars for the P228. Mags the extend out a bit are available all the way up to 33 round canes for the 9mm Glocks. Prices vary, but the most affordable are preban BHP mags, I've seen factory mags for $60 and MecGars for $50. Glock 19 and P228 mags range from $75 to $125. Although Glock 19 preban mags are easier to find. Postban mags are nearly equal in price. They run about $20 or less.
As others have said, rent and try them all before you buy.
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So many pistols, so little money.
[This message has been edited by Tecolote (edited June 29, 2000).]