The most expensive stuff you can find.... J/k regular solder is good, just make sure you create a strong/solid joint. I personally use some eutectic 63/37 as it melts and flows very easily. Since you are only making a few solder joints, you only need to buy a small amount (like in the tubes) at your local hardware store. I wouldn't spend more than 5 bucks...
What's more important is how skilled you are at soldering. Right now, I'm using a leadfree variety by Qualitek from their SN100e line. I prefer 63/37 or 60/40 for usability, but I figure that I should start trying to be environmentally aware.
Eventhough it is forbidden meanwhile, I am loving the solder with lead and silver. Fortunately I have something at work. Tomorrow I can give you the detailed chemical composition..
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