Building A Polk Audio System

Hello everyone,,
I've been looking into a polk audio system and the speakers are on a sale right now through amazon. I have the option of buying the "Polk Audio TSi300 5.0" package for ~$670 including a PSW108 sub OR going with the T series: 2 T15's and 2 T50's with a CS10 center with the PSW108 (which is majorly discounted) for about $510. Each will be paired with a Denon receiver in the future. Is the TSi different from the normal T series, and if so, is the difference noticeable? I am trying to decide if there is an advantage to the TSi or if the T Series would do the job. These speakers will be for a mix of home theater and music use.

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