I think both ways are right, but I still rather go for pills, so spend 500 every 2-3 month. Yes, you won't save as many refines as guy who goes in on turn, but you will have 2 more pills, because I assume you are able to get 2 more rebate. So you will save much more money because pill is aprox. 10k.

guys so chose your way, it's up to you :-)

My 2nd item advanced to lvl10 at 997/1000