Bear in mind I haven't tried the pushchair with a baby in it though!!! Although both my mum and my gran have had a go at pushing, comparing it to a M&P one that they use with my neice, and both think the Infinity is great - much lighter and easier to manouver apparently!
The only thing you might want to think about though if you're in and out of the car all the time is that it doesn't fold down to a very small size - just really collapses onto the base and the wheels are quite big, so if you have a small car I think it might be a struggle. But then again, most buggies or systems I've seen suitable from birth are quite bulky when folded down.
I got it from a website www.preciouslittleone.com - they do a lot of Hauck / I'coo products - I found their customer service really friendly as well which was reassuring as I had lots of questions about adaptors for car seats, sizes, colour etc before I bought it.
I just really searched around online till I found the best price, and the green colour, which was the colour I wanted anyway, was being sold as an end of line which is why it was such a good deal. £300 seems like a good price if it's the package i've seen in red and with a car seat (especially compared to some other systems!!!)
Let me know if you've any other questions though