I'd look at active monitors, they'll cost a bit more, but they've got amps built in and will plug straight into your interface. those would appear to be fairly equivalent to the monitors you linked to earlier
http://www.dolphinmusic.co.uk/shop/flypage/product_id/6425
Protools is for music production, just completely different from what reason does. You can't record audio into reason, you cant chop audio in reason, you can't run VST plugins in reason etc. It is just a rack of (very good) virtual instruments with a relatively basic sequencer.
Protools, cubase etc are very powerful multitrack sequencers that u can chop and manipulate audio in, apply vst plugins to individual tracks, record audio into, route audio tracks etc.
Reason can also be 'rewired' into all the major DAW software, so it effectively runs as a plugin and can be controlled by your main sequencer.