i dont like any sip products, i have sip electrodes for arc, and i cant get on with them, and have used sip solid wire and didnt like that either
i will try and get the name of the wire im using now for you
you may want to look on weldequip, they sell sifbronze gasless wire, 9.8mm 045kg reels for 8ish quid ex. delivery. quite a reasonable price and sifbronze have a good rep on here i beleive
the wire i am using is 'maypole welding' gasless mig wire at 0.8mm dia. seems pretty good, not much spatter and nice solid welds from a 100amp mig
if you look at my first project thread, i made that entire frame with this reel and its stood up to me jumping up and down on it