Put your system in stereo (2.1). Can you hear the M60s? If not, troubleshoot. If yes, see my recent post in another thread about relative power delivered to the center vs. front speakers during movies. In one GOT scene, I measured 16 times the power into the center relative to the left/right.
The v4 speakers are a completely different animal than your Ti. If you can't afford M5s and a 160, just get two M3s for the front. The M3v4 are far better than your M60. In fact they are better than my M80v2. You can get a centre and a 500 later and eventually upgrade your M3s to M5s. You don't need anything more than M5s for fronts and a 500. In fact, you can be perfectly happy with M3s for fronts if you're really cash-strapped. However, once you hear M5s, you will never go back to M3s because that's just how humans are.
Look in the refurb or B stock store for better deals. If nothing in there, look at factory direct. Buy only v4. V4 has the OhSoSweet tweeter that Andrew is so proud of and it is indeed a gift from the tweeter demi-God. V4 may also have other changes I'm not aware of compared to v3.
As for the sub, you only need one cable. The other jack is for a second sub.
Make sure the speakers are not set to 4 Ohms in the receiver.
