I was wondering if I should get monitor 40's or tsi200 or RTi4. I am looking for them as rear surround speakers. I am kinda budget in mind but will pay more for a much better speaker. I see on new egg you can get monitor 40's for 129.99. The tsi200 I can't find under 300. Is it worth over double the price? I would like it to be more powerful. I don't know if the RTi4 is as powerful as the 40's or tsi200.