It is definitely a good deal but my advice is to try to make a trip to a store that carries both lines and test them out if you can as they have extremely different sounds.
The Klipsch Speakers have horn-loaded tweeters which gives them an overly-aggressive sound. (imo) I owned a set of their speakers that I returned because it honestly hurt my ears to listen to them. Some people love this type of sound, but I am not one of them. I would say for HT that they would be great, but for music they just are not my taste at all.
The Monitors are supposed to be more of a neutral and warm sound, although some refer to them as "bright". The majority of the people whose reviews I have read enjoyed them thoroughly, especially for the price. I have not heard these so I cannot give you much info on them. They are discontinued but if you have a local electronics store such as Best Buy, they will carry their replacements, the Polk TSi Series. They are reportedly a little "brighter" than the Monitor's, but it will at least give you an idea of their sound. Most likely they will have the Klipsch Synergy Series, as well. They won't be identical as the Reference speakers supposedly sound much better, but you will get a taste of the "horn-style" speakers to see if it's your speed or if you would prefer something else.
The Onkyo 608 is excellent. The only thing I have read of it having problems with is video processing. Aside from that, it has great features and plenty of power. Onkyo makes some great receivers.
I hope this helps. I don't want to advise past my level of experience (which is very little. lol) so hopefully someone else can come along and fill in the blanks.