Onkyo 608 is a more all-rounder av amp, a UK MAG
WHAT HIFI 5-star product and easy to match speakers.
Denon is also a good choice and less expensive !
Q Acoustics is a popular speaker brand in Europe and
Model 1010 and 1020i series are good value for money.
Wharfedale Diamond series is not expensive too!
For Marantz, if you consider 5005 will be better than 1601. For concert or music, marantz should be the best, for movie, Denon and onkyo should be better.
Amp have 175w output but you need to know how many ohm it's driven, let say it's 175W at 6ohm, but your speaker is 150W at 8 ohm, then it should be no problem since the output will be much lower if the amp driven at 8 ohm.