My first Rev was a 1.5 SLE. It was a gift, so I was happy with the color, it didn't matter
My next Rev was a B-series Full-Vent (Black & Lime) [Alright, I liked that]
My next Rev was a B-series Std Sail (Black & Purple) [For some reason, that kite just didn't look right in the sky(?) to me]
My next Rev was a B-series Mid-Vent (Black & Lime) [Alright, now that looked more like it, again]
My next Rev was a B-series Std sail (Black & Lime) [Voilą! My set was now complete, and matching]
Different strokes for different folks............It's definitely a personal thing ! Do what feels right to you !
I suppose I should clarify my previous response. When I said "Matching", earlier, I was referring to kites of the same model, such as the B-series, that are available in std, mid-vent & full-vent. As for completely different models, such as Rev I's, Rev II's, etc, the more variation (Mixed), the merrier !!