As a main computer, I wouldn't go the netbook route. You can get a more robust desktop computer for only a little more money and not be stuck with a small keyboard, less RAM, no DVD burner, and less computer speed. Right now, in the US, Staples is selling, for $299 (Office Depot has the same one with a rebate that drops the price by another $30):

 

Compaq CQ5300Y Computer, Q1859 18.5-in. LCD Widescreen. AMD Sempron LE processor. 2GB memory, 320GB Hard Drive, Lightscribe DVD +-RW Drive. Windows 7 Home Premium

 

I personally don't like Compaq computers, but you can always get more computer power in a desktop for less money than with a portable computer. The Compaq just happened to be the cheapest computer I could quickly find on sale in stores--to help illustrate that a netbook isn't necessarily a huge money saver.

 

With Poser, you want more RAM, more disk space, a faster processor, and a multicore processor to speed up renders. To back up Poser downloaded content, you'll want a DVD burner. There are portable burners for netbooks, but that's adding extra cost.

For portability, a netbook is my choice for mobile needs. I've been using Poser 5 on mine and it works very well with it. I'll never go back to a laptop again because I'm more than willing to trade off a smaller screen and keyboard for more portability and battery life and less weight. My computing needs on the road are less than they are when I'm home, so portability is a higher priority for me than other factors. Since I have wireless at home, a netbook is nice to be on the net while away from the desktop.

My visual indexes of Poser content are at http://www.sharecg.com/pf/rgagnon