I am on my second 2008 Rs/gs. Welcome.
Seats: I like the stock one but it is not perfect. I use a beaded seat cover on it and love. But I deny that it is mine when people ask what it is. There are any number of gel seats, butt buffers, Air Hawks, sheepskin pads available. The choices are many and I doubt that any one is perfect or even suitable for everyone.
You can buy the BRP comfort seat. I had one and liked it. I wouldn't buy another. Russell Day Long makes custom seats by mail in. Corbin also does this. I have never had either one but have bought a spare stock seat to send to Russell Day Long. There is a another vendor on here but the name doesn't come immediately to mind. They make an aftermarket seat that people seem to like a lot.
My advice, not that you asked for it, is to ride a while and see if you really do need another seat. After doing 1200 miles in three days this week, I am not certain that a custom seat is going to add that much to my riding enjoyment. After being caught in the rain I was very thankful for the fact that the standard seat is waterproof: ie the foam does not get wet when left in a rain shower. Most custom seats will get the foam soaked due to the stitching leaking water.
Let me end by saying that when it comes to windshields, seats, motor oil, cleaning supplies you are going to get a lot of answers. They are all personal (well not the motor oil) and you may have to experiment a bit to get what is right for you. I find that part of the fun.