Congratulations on your K-5 - it's an awesome camera, and capable of excellent image quality even by today's standards
Also, that's a nice Giottos tripod - I use one very similar to it... They're very good quality.
As @kyteflyer already asked, it would be helpful if you could let us know which lenses are in that photo. Two of those at the front look like Sigma, one at the front and one at the back appear to be Tamron. You might have all you need for your purposes already
A word of well-meant caution and advice... In your photo, your camera has no body cover in place (to protect the circular opening from dust ingress). In that state, dust can get inside the camera body and onto your sensor. As such, it's best to leave a lens fitted to your camera at all times, or alternatively fit a cover to the mount (they are available cheaply on eBay). Also, get yourself a "bulb blower" to blow dust off the sensor and out of the camera. A little dust on the sensor won't obviously affect a lot of photos, but it will certainly affect some