what Amp should I get?

Hi guys.
I have a pioneer TS-C160R in the front http://www.cardomain.com/item/PIOTSC160R
And i got TS-E6996 in the back http://www.pioneer-eur.com/eur/product_detail.jsp?product_id=7811&taxonomy_id=25-131
And i'm looking for an Amp. So what kink of Amp should i get?

I would say any good 40 - 50 watt/ch 4 channel amp would work