A few tidbits...
If you do go with the TSi series, wait for a sale. I bought TSi300's for my L,R and got them through Newegg for $129 each. The sales come and go fairly quickly, so if you can stand waiting and watching for a week or two, you can probably save some money.
As the other poster above mentioned, you can get more speaker for the money with the Monitor series. At equivalent 'deal' level, you can get one model higher in the Monitor series. (@Newegg's best recurring sale prices, TSi300=M60, and TSi400=M70.) However, the TSi is a bit different looking speaker, so you'll have to decide which look you like, if that matters at all. I bought the TSi because it matches well with my sub and my TV.
As to the sub, the BIC PL200 is, IMO, a great deal at the $269 price it can be found for. It meshes very well visually with the TSi series, if those are what you end up going with.
Best of luck, and enjoy whatever you decide on.