Yeah dude....the 15" is pretty cool but not as one of my main cymbals...like you said....it's nice to have on the side...I do need a 18"...I love that size as a crash....I also need a splash (since i'm the main drummer now....the church will be buying some new cymbals...sick) I usually go with Sabian but not limited to it...if I see a Zildjian or any other that I like I get it.
...added to that 15" A Custom Crash and the AAX 16" you have.
Zildjian Cymbals18" A Custom Crash, 18" K Dark Crash Thin, 18" K Custom Dark Crash
6", 8", 10" A Custom Splash
18" A Custom EFX
20" K Custom Ride
20" K Custom Dark Ride or 22" K Custom Med. Ride (Dennis C., Sonny Emory)
22" A Custom Ride
13" K/Z Dynobeat Hi hats, 13" A Custom Mastersounds hats, 13" A Custom hi hats,
Sabian Cymbals...check these out:
21" HHX Groove Ride (brilliant finish), 21" HH Raw Bell Dry Ride (brilliant finish), 20" HHX Stage Ride
18" AAX Studio Crash, 18" AAXplosion Crash, 18" HHX Evo. Crash
AAX 6", 8", 10" splash
18" HHX Evo. Ozone
18" AAX El Sabor Picante Hand Crash (lovely addition)
13" AAX Fast hats (brilliant finish), 14" HHX Groove Hats, 13" HHX Evo. hats
...check these out and see what works for your pallete.