When we bought our house, I loved the look of the Pella windows the previous owners had installed. Like you mentioned, they were wood on the inside and vinyl on the outside.
Unfortunately, over time I've grown to hate our Pellas. It seems that (at least the ones we have) are designed badly. The screens that came with them are one piece, so you can't raise just the bottom half without removing the whole thing. If we forget and leave a window open and a summer shower moves through the wood on the inside of some of them gets wet--a problem for the wood, of course. The grain has been raised on a couple this way. It's especially a problem on the couple we have that swing out to open. And don't get me started on the slider!! ARG! The screen on the *inside* so that all the bugs come in when you try to close up for the evening!
BUT, we have replaced several windows with Harvey vinyl windows which I LOVE. They have been fabulous! Function well, easy to clean, built-in secondary locks--I couldn't be happier. In fact, we will soon be replacing out second Pella slider with another Harvey slider and I can't wait!
Yes, the Pella's were pretty but after living with them I can't say that I'd ever buy another one. The Harvey's, on the other hand,have been a great buy all around. We had Chuck DeRossi from DeRossi Classic Homes do ours and he was exceptionally fair, professional and the quality of the work was terrific.