After years of no carpeting, we are finally putting carpet back into the living room and dining room. Can you please share any info on vacuum cleaners. Looking for one that doesn't cost an arm and a leg. We have 4 dogs and a cat. Any help would be greatly appreciated. Don't want to spend more than $150.
I was able to get my Hoover Platinum upright for a steal. 
I'm speaking as someone with 5 cats and 3 dogs inside, plus 2 more dogs who prefer the outdoors but are welcome inside whenever they ask.
Only the Dyson worked for us. I watched Woot (woot.com) and got a great deal on one. The advice about BB&B is great, too! If you want pets and carpet, you really need an amazing vacuum or you're going to have all kinds of nastiness trapped in the carpet which can make you sick, even if you don't have allergies or asthma. Spend the extra $$, you will not regret it.