I have heard nothing but good things about The Planet data center. But you are right about one thing you are going to pay. If its in your budget, then by all means go for it. But there are allot of quality data centers out there. As QBall15j stated
www.colostore.com offers quality co-location for $49.99 per month. And also
www.colo4dallas.com and
www.steadfastnetworks.com offer quality co-location for a reasonable price. Stead Fast Networks being the most expensive.