[amsat-bb] One more soldering question

I know this is a bit off topic.... I am finally ready to make a dipole or two. I noticed that the solder I've been using (it came with the Weller gun) is 60/40. I am Planning to purchase a bit more and it seems to come in a variety of mixes. Is there a preferred solder for amateur use and where do you typically purchase this? I was looking online, but would love to find it locally.

Thanks,

Zach