So I got a S&W Model 66 .357mag. What next? I want semi auto. Have about $500 to spend. Prefer full size handgun in 9mm, .40, or .45ACP. OPEN TO ANY SUGGESTIONS? What would YOU get and why? I kinda like S&W 5906 or S&W M&P at the moment. Just really torn on what I should get. Have some experience with handguns and do know my stuff but don't own one. Now, let the debates begin...