OP - you really need to ride a SRAM-equipped bike if at all possible. The Double Tap shifting style is different from Shimano, if that's what you're used to. It only takes a little bit of riding to get used to the SRAM, in my experience. But like pizza and ice cream, everyone has their own preference and some people like SRAM and others like Shimano, due to the shifting method, the egronomics or both.

If you decide on SRAM, you might consider the Force 22 groupset if it's in your budget.