I am getting a new bass and have decided that when I first get it I am going to stick with spirocores for a while to get used to the bass but I still think in the long run I'm going to be trying different strings. What I'm thinking about doing is maybe keeping the spirocore E and A but changing the D and G. I'm thinking about trying eudoxa, velvets, obligatos, or possibly just gut. And I was wondering from people who have probably already had experience with these, which out of the ones I listed with last the longest, and also I was worried about sustain compared to spirocores. And just for reference I play probably 90% pizz and 10% arco. Also, A few days ago a played someone's bass who had EAD evah pirazzi and a velvet G string. I didn't care for the Evahs to much but I really liked the feel and sound of the velvet. The only thing the owner of the bass said was that the intonation is a little different on that string from the others, is common with mixing strings?