If at all possible, try to get to a Titleist fitting near you.  When I was fitted for my Vokey wedges, we looked at loft, different grinds and what types of courses I typically played.  Being able to try out the different grinds was extremely helpful.  I was fortunate enough to go through a fitting in Oceanside so I was able to try absolutely everything.  That said, my fitter asked about what types of greens(firmness/softness) and what types of distances I typically had into the greens. Based on that we were able to get the proper gapping for my wedges.  Good luck and I hope you are able to get what you need.

Kevin,

Greg T's advice is really good regarding the custom fitting questions (courses you typically play - firm, soft, lots of elevated greens, etc., whether you have a steep angle of attack on your wedge shots or are more of a sweeper, etc.).  Titleist has some great information and guidelines regarding wedge gapping and which grinds might be best for you in the Vokey wedge selection guide (http://www.vokey.com/wedge-selection/wedge-selection-guide.aspx).  I personally went with 4-degrees of gap in my wedges (like you I have a 45-degree PW) so added a 50, 54, 58, and 62-degree.  Depending on the course being played this gives flexibility to swap in another hybrid or long iron for the 62-degree if there are not a lot of elevated greens.  One other thing I found really helpful was how to get more out of my wedges by practicing the techniques in Dave Pelz's short game bible book, whereby you essentially can have anywhere from 4 to 12 different shots for each wedge (1/4, 1/2, 3/4, and full shots, with different hand positions on the wedge - regular vs. choked-down, and degree of openness of the wedge face - standard vs. exaggerated open for cut shots, etc.). Regardless of whether you go for 4-degree or 6-degree gaps in your new wedges, the Dave Pelz information will help you get the most out of them.  Hope this helps!

Thanks,

Michael