If your wanting a budget helicopter that's a lot of fun to fly in the 450 category, Try the Walkera 450.
Look on Ebay for them, them come as a RTF, and a BNF if you have the correct radio. It has to be a Devo 7.
Anyway,I have everything from mini's to 1/4 Scale Heli's. To play around with and put some stick time in, I still pull my Walkera 450 out and fly it several times a week. There almost maintenance free, parts are cheap, and they're easy to work on. My batteries last almost 16 minutes which is almost unheard of.
You "cannot" build one for the price they are selling them at on Ebay. Their not there everyday, but you will catch them a least twice a month.
I don't own stock in Ebay or Walkera, I like the Heli, and I love the way it flies out of the box. It's very forgiving and smooth when flying. I recommend this Heli to a lot of kids and people who are wanting to get into the hobby. Believe me when I was it's easier to fly vs my Trex 700 or my Scale MD500. They are like in "self level" mode all the time. but you have to do your job as a pilot.
If you have any questions, don't hesitate to ask. I will try to find a URL for you to look at them. I have had nothing but good luck with them.
ONLY GET THE D03 MODEL: There are other models, but this is the best, just believe me as I have tried all of them over the past few years. Also, WATCH the shipping charges, some are free shipping, some charge a lot for shipping.
I would be willing to make sure you get a good one if you would like me to help you. I have seen these on Ebay for $180.00 before, but their averaging $200 now, which is not bad.
This is a RTF:
Professinal Walkera V450D03 6CH 450 RC FBL Helicopter w/DEVO 7 Transmitter C8T1 | eBay
This is a BNF:
Walkera V450D03 6CH 450 RC FBL Helicopter Without Transmitter BNF US Stock 0RJ1 | eBay
This one below is a SCAM,
BEWARE, there really are a lot of Scams out there now. I see several ads like this and that the first clue that it is a Scam.
This is a used one, the only good thing is he states he has two batteries, plus he says "Make Offer": Walkera V450d03 RTF with 2 batteries and receiver battery | eBay
I hope you the best, I know it's really fun building your own, but price wise,this is the only way to go. If I wreck one (usually trying 3D tricks or something) I just buy a new Heli off Ebay and I acquire a lot of spare parts. you can't buy the parts for what they are selling the whole unit for.
FWIW, I have tried Trex 450's, their more money, over $100 more, but the Walkera's fly better in my opinion.
Anyway, any questions, just let me know,
Dennis
looks like mine and probably many others members collection of 450 parts 
