I had a pair of Shure SCL3 earphones and I loved them! I lost them the other night

I'm looking to replace them but was thinking of upgrading to the SCL4. Is there a huge difference between the two? I know the SCL4's are about 100 bucks more but for that 100 bucks is there really a big difference?
I use them for both my ipod and my wireless in ear monitor
Thanks