The choice is a bit of a tough one in my opinion, here's why:
- RX 300 & 330 have been around for a while now & have proven to be excelent with reliability, fairly frugal with gas (all things considered that it's an SUV) compared to many other models. I know the Prius has a battery warranty of 8 years or 100,000 miles for "hybrid related components" I would assume that The RX 400h is about a year longer & maybe 12,000 miles more. The problem is if down the road something happens to the "hybrid components" like you need a new hybrid battery? I hope by then the prices for a replacement will be a lot more reasonable. Most top quality mechanics should be able to perform service but will they be able to work on complex things like a hybrid vehicle if they are not trained & your stranded in the middle of nowhere? Just some things to consider.
Don't get me wrong, I think the hybrid concept is fantastic & we are going to see millions more on the road 10 years from now.......I'm just not a huge fan of being the "pioneer" if you will with reletively new technology for longevity when it's still kind of in it's infant stage. On the other hand, one can't get much better than the luxury brand of Toyota....Lexus! :D