Go with Bulk reef gfo granuals they tumble better than pellets. As far as the carbon, I use the BRS lignite and am very pleased BUT, the lignite has been linked to hole in the head syndrome in tangs. I will be switching to BRS ROX8 after mine runs out. Jmaneypanda posted the thread with the info about the lignite. you can probably find it. For real though get a couple extra of the inner canisters to save time during your WC routine. I change my carbon every 2 weeks and GFO every 3 to 4 weeks. I'll post a link of the canisters so you will know what I am talking about. It really really really saves time.
Edit: http://www.bulkreefsupply.com/store/modified-10-refillable-cartridge-for-use-with-brs-reactor.html">http://www.bulkreefsupply.com/store/modified-10-refillable-cartridge-for-use-with-brs-reactor.html</a>
these are the extras. You will get one each with each reactor. each cartaridge has 3 sponges. With gfo you put a sponge in the top, then a sponge in the middle. you add your gfo and then screw the bottom on and it has the 3rd sponge attached to the screw on bottom cap. Carbon is different, you put a sponge in the top, then you pour in your carbon. Then you shove the 2nd sponge up to the carbon and press it in tight. you don't want the carbon tumbling. Then you screw on the bottom cap and sponge. Watch the BRS videos they really are well made and very informative. Also there is a calculator on the site. you type in your total water volume taking in account for how many gallons you lose from your rocks. Tell them what type of media it is and it calculates how many tablespoons to add. Very simple to do. When you get it all hooked up you need to rinse the media again very simple. You will enjoy the results. The most noticable thing to me is how the carbon takes the yellow tint out of the water. I'm really glad I run both GFO and Carbon now. Its worth the extra expense. Good luck bro get ready for an even better looking tank.