I will be making a descision on some bookshelf speakers very soon but i understand that most bookshelf speakers will need a sub to close the frequency gap. So, i was looking at subs on ebay and found some factory remanufactured infinity interlude 120s that usually ended up going for around $300. For $100 more, i would be able to get a Adire Audio Rava that everybody on this forum seems to be raving about. However it will be awhile before i can come up with the extra money (probably about 3 or 4 months). Is the rava that much better then the infinity or any other sub in its price range for that matter?