We just went through the search for a loft for DD11. She wanted the Sleep and Study loft at PB Teen, but it was crazy expensive and also full-sized - she has a small room and really needs a twin bed. We considered the loft beds at Costco since they got good reviews, but she really wanted a white bed. We ended up getting a loft from collegebedlofts.com and painting it white. It was pretty easy to assemble and it is very sturdy. It's not finished as well as the PB Teen beds - no turned posts or pull out drawers, but she has a desk area as well as some shelves, and it was less than $700 delivered. We bought the quilt she wanted from PB Teen, some of the twisted sheer PB Teen curtains, and some paper lanterns at Ikea (much cheaper than the PB Teen lanterns). We added a rug from Target, and her room looks awesome for under $1000 total.
We have bunk beds from PB Kids that have held up well, and the kids each have dressers from Pottery Barn (not kids) that are close to ten years old and look great. We also have a couple of nightstands that still look nice.
You might find some coupons for sale on ebay. We were fortunate to know someone working at Williams-Sonoma when we bought the bunk beds - she used her 40% discount for us and saved us several hundred dollars.
We got a bed from collegeloftbeds a few years ago and have been very pleased! Very easy to put together and was great how it came pre cut and holes drilled in. Not sure if they still have it or not but at one time on their site, they had lots of photos from customers - shows great styling and design tips!