You want to SP farm?
Listen up:
Go here:
http://sro.mmosite.com/x/
Find what you want at level 70... then find out HOW much SP you need for it.
Then go here:
http://stud3.tuwien.ac.at/~e0125557/sro/spgain.html
That tells you how much SP you will get with what level gap if you have that gap for the whole level.
Then Ctrl A and copy the table, open up excel and paste. Then delete all info for levels below the level you are. Then sum all the columns from your level to level 70 and find which one has approximatly the amount of SP you require for level 70. Then keep that gap all the way through.
Keep in mind that WHEN you get to level 70 and IF that is before the update ALL you can do is SP farm. So I would do the minimum build possible that will allow you to kill mobs with ease.
Also note that killing GREEN mobs is better than killing ORANGE or RED. Unless you have a SOS+3 or SOM etc...
My SP Farming
Currently I'm keeping a 2 Level gap which will give me 96k SP between level 42 and 70. That will allow me to get all the Bicheon I require and all the Fire I require. Althought it won't let me get the BEST skills, but will allow me to at least level at a good pace. When getting closer to level 70 I may increase the gap, but currently I don't know.
I get about 147 sp exp per small bunwang I kill. And now I kill them with easy. Currently leveling me wolf on them cos they aren't agro.