I purchased my first large rack yesterday. Thanks to westcoastjungle for the tips and advice...

It is a cb-70 Vision rack that was very reasonably priced and I love the versatility of it. You can change the level height and convert one level into a hatchling level. Vision uses heat rope rather than flexwatt heat tape and you can run the heat rope horizontally or vertically along each level, which i think is pretty nice. Some will argue the quality of the rack because it is plastic. I can understand the argument, but i haven't received my rack yet so I can't really say much about its durability.

If you're willing to spend more, go for Freedom Breeder or ARS. Both are raved about by those who can afford it. It is expensive...it is quality.

Lets not forget about Rich at Reptile Basics and Rich at HerpEnclosures.com as well.

All of the above are suggestions you can't go wrong with. Do research on each company and find a rack that suits your needs and your budget.

As far as building your own, if you're good with measurements and comfortable with building your own, go for it. It's the most cost effective method..but it was a pain in my butt. I built a rack that could house 7 adults, but only 3 sorta work....waste of time and money..but it was a learning experience.

there are a few DIY's on this site that are very detailed and make for a great read

Good luck!