Personally I think you should do it in stages, get a cheaper poweramp like a emotiva, outlaw or monoprice or jbl , maybe something like 100w X 7, keep it for a few years, then upgrade if needed, or reuse elseware or as rear/side amps. As a hobby it would be boring getting final high end system straight away, if you just throw money at it don't appreciate it as much, or if you went from 10" 150w sub to 18" 2000w sub you'll notice and enjoy it more..think ah right that is why it's better, you'll go through collection again and for me it's far more enjoyable putting it together over time changing parts, learn about it, add parts as needed, buying them reduced price, enjoying a much better system than simply buying new all brand new and full price. Since I'm pretty close to completing mine (just require hdmi av pre amp, a second sub, and heights) it's not fun thinking about changing main speakers because there is no point as those are flagship, to get better means such a big upgrade be over my paygrade, but I'm glad I started off lower down.
Would be boring if I simply went into a customer installer with say £50,000 and say put a good system together (no idea of brands, different designs, how it works, what each bit does, reading up alternatives, the benefit of a item, fitting it myself and hearing difference. I remember talking to local av dealer he said just had a customer walk in with a blank cheque, say want a high end system, no interest in specifics of it...I think that's a bit sad. If I was to order and buy say antimode dual core, I'd want to know what it is, wire it myself, do calibration myself (but get advice on more complex results of the response etc) I went from budget kef coda to flagship over years.
Amps do not last for life. A long time yes but not decade after decade.
Klipsch are not well liked due to too bright top end.
I also read that klipsch are also not as efficient as advertised, they were several dB from rated closer to mid 90's