I personally love Maker's Mark. I've been a fan for years. I notice a definite change in flavor between mixing say Jack or Crown with Coke and mixing Maker's with Coke. I even notice a flavor change when mixing other bourbons over mixing Maker's.
If you like bourbon and maybe want to try a bit of a sweeter flavor with it, try out Jim Beam's Red Stag. It came out last year and is an 80 proof black cherry infused bourbon. It's become a favorite of mine lately. Granted it might be too sweet for some. I think it works good as a shot or mixed with Diet Coke since mixing it with Coke is too sweet for me.
I was at the liquor store yesterday and the guy recommended I might like to try out Woodford. It was a bit more expensive than what I wanted to spend as I was already spending $200 there so I didn't pick up a bottle. But it's reviewed well and I think I'll try it next time.
I personally am not a fan of any whiskey straight, but that's at least partly due to my having some stomach issues and straight whiskey causes me to have bad acid reflux.