funhiface -- I've heard some bad things about the Astronomy cluster... the Astronomy courses are offered on an irregular schedule which can be annoying and more stressful than necessary.
Unsurprisingly, I would recommend the Cognitive Science clusters. Look for clusters with any of BCS 111/151/152/153/172. They are good classes (well, it depends on the instructor). I would avoid a cluster with BCS 110 as it's more science-y and the curve is competitive.
Any cluster with CHM 131/132, BIO 110/111, PHY 113/114, MTH 16x or computer science are not worth it, period.
Of course, this is just my advice. There are many options-