...wondering how they compare tension wise to Sunbeams
I've tried both the Sunbeams (45-65-85-105) and the D'A 170BT (45-60-80-107) and found the D'A quite a bit stiffer, thanks to the hex core. The 220BT set might be closer to the Sunbeams in overall feel, though.
Specifically the 220BT set. BTW, can't find the 5 string set at Basstringsonline.
I don't think there is such a thing as a balanced-tension 5-string set. All you need to do is to get the 220BT 4-string set and a single 125, which are both available from BSO.