My advice is to shoot a few to several matches with what you've got on the gun and then make a decision. There are plenty of people who shoot IDPA or USPSA with stock Sig or Glock sights who do better than fine. Some people prefer a fiber front with stock rears, some prefer all black (me), some prefer night sights, etc. It's really the last thing you need to worry about for your first year of matches. If you're looking to spend money on something make sure you have a decent holster/pouch rig and plenty of mags or get started on your reloading setup. Both of those expenses will take you farther than sights.
By "Bluegrass" are you referring to Bluegrass Indoor Range (Louisville) or Bluegrass Sportsman's Club (Lexington)?
Also check out Silver Creek Conservation Club in Indiana, which is only 14 miles from downtown Louisville: http://www.silvercreekcc.org