I have a new Riff Raff with Alnico V in the bridge of my LP, with a Stormy Monday with Alnico IV in the neck. This gives me a great classic rock sound, but leaning towards the blues end of the tones. If you are an old Fleetwood Mac fan (Peter Green era), and remember 'Green Manalishi', then you can imagine the driving tone of the Riff Raff, but it cleans up beautifully for Black Magic Woman or Need Your Love So Bad tones.
I also have a Les Paul with an Emerald in the bridge and a Mule in the neck. This gives me a bit more push on the amp and a bigger rock tone (the Emerald can nail the Thin Lizzy sounds, as it's name implies). The Mule has a little more fatness than the Stormy Monday, but still is very sweet, think Paul Kossoff instead of Peter Green!
I also have played Tim's Goldtop with the Mule set and know why he says that this is the classic LP set. You can get most of the tones from the Emerald and Riff Raff with Mules, depending on your amp and any pedals.
I like the fact I can get the sounds I want with just the amp and guitar, but I have more than one guitar for different things, so I can tailor them a bit more.
It is really a hard call which you go for, but loking at the stuff you like, the Mules might be a better choice than the Riff Raff. You don't say what amp you are using, I have a Marshall Silver Jubilee and a Fender Princeton II. The Riff Raff prefers the Marshall, not that the Fender sounds bad, it is just a bit more toppy than a Mule or VHII with the same settings on the amp.
I have finally ordered a good mic to record some things, so when it comes I will put a couple of clips up to try to show the Riff Raff and Stormy Monday.