I don't know about you, but waiting until the end of the year will be too long. I'm doing alright saving up myself because I will unleash as many as I can for Tiger Lily when she comes back around. I WILL get Tiger-chan... or you'll all see me crying on here. XD
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I kept my most powerful units as 1 and 2 filled with the rainbows and golds I got. 3 and 4 became back-up squads as a "just in case" those powerful squads failed but weakened the pests enough for clean-up. Right now, squad 3 has become more powerful due to filtering in more golds and silvers out. Eventually the same thing will happen to squad 4. If I ever decide to whale or get lucky with more rainbows, the cascade down effect will follow the same route as I figure on filtering out golds that don't hit hard enough or whose abilities aren't helpful enough to the squad as a whole. That's my approach anyway. ^_^