What are some thoughts about the Blade 450 Pro for an intermediate heli pilot.
This is a good choice for a 450, especially if you do not already have a programmable radio since this comes with one (dx6i). Yes, Horizon has good customer service as well.
I would prefer a 500 class, for the size and stability, but my budget is around $300.00 so that's not gonna happen. I am looking for a reliable good flying heli that is 3D ready/capable and flies solid.
If you are looking for a TOTAL price around $300 you aren't going to find anything in the 500 class near this unless you go with cheap clone stuff across the board including transmitters, etc. The super combos for TREX 500 are tough to beat for initial price. But don't forget you ARE going to crash, and the TREX prices for replacement parts are significantly higher than the 450 class. If you are able to find a way to come up with some more $$ initially, I can recommend a great alternative in the 500 size (see below.)
Also what is the difference between the Blade 400 and 450 pro?
The blade 450 is a newer version with slightly upgraded mechanics, and better electronics for 3D. Same motor. Same pricing most places. Get the 450 unless you see a crazy deal on the 400. Here is a link to the blade 450 on amainhobbies.com: http://www.amainhobbies.com/product_info.php/cPath/2_382_708/products_id/201230/n/Blade-450-3D-RTF-Electric-Helicopter
You can use the following coupon to knock off $25 : DPPAN1125
Last but not least, if you wanted to spend a little more to get a 500 class, I would recommend this one: http://helidirect.com/msh-protos-500-plastic-kit-with-scorpionmotygeescsabblades-p-22446.hdx
This kit comes with a scorpion motor, SAB blades (expensive, high quality blades) and a YGE speed control (second in quality only to Kontronik.) The ESC alone is worth $140, the blades $60 and the motor $70. This heli is heads and shoulders above a TREX, and the replacement parts are closer to 450 prices than 500. Of course you will have to buy electronics including transmitter/receiver but over time its worth it.