Replacing a picture window

Our huge picture window has been in bad shape for years. We are considering having it replaced with a slightly smaller window or group of windows - has anyone done this recently enough to give me an estimate what it might cost? We'll be having it done as this is beyond what dh can do, especially with his back issues.

The house is nearly 60 years old and this is the orginal window. It measures around 100" wide and about 4 or 5 feet long, but we want to go a bit smaller while still being in scale with the house...Liz.