Questions for the pros

Great Site!
couple questions, I am a Carpenter working on my home
I bought some Granite (http://tanbrown.org) from a local tile store that stocks alot of Granite (http://tanbrown.org) Tiles (http://www.g682.net)
and (http://maplered.com) they also sold me some dry polishing pads to polish the edges, They told me I had to use a sand (http://maplered.com) er polisher that didnt go faster than 3500rpm or the pads would blow up, Didnt have a vs grinder so I just used one of my big 7" grinders (spins about 6700) and (http://maplered.com) went slow, everything came out ok, Only had to do about 15 edges

Now Im on to my bigger project,
The pads worked great but is this the right graduation for the grit ,this is what they sold me
80
240
400
600
800
1200
Is this ok?

got 5 of each for 25$, used 2 of each for the 15 edges

hate to buy another grinder I have 4 already But if you guys think its a must then I will

Also can I put an alpha profile wheel on one of my grinders take some tubbing and (http://maplered.com) throw some water at it? Or am I just wasting my money on the bit
Id like to do a few bullnose but dont mind the polished edges . I have 3 more Stone (http://g603.net) projects in my house that I will do, dont really want to buy alot of Stone (http://g603.net) tools as I dont intend to do anymore Stone (http://g603.net) work after I am done.


That first project really educated me on what it takes to lay Stone (http://g603.net) Tiles (http://www.g682.net) (being in the general construction trade for 24 years I have to say I have a new found respect for you Stone (http://g603.net) guys-or gals)
I figure family and (http://maplered.com) friends can hire it done by a professional
Thanks
Colt