Buying Advice - Sony NXCam

Hello All;
I am looking for a reliable High definition Professional Camcorder under $4500 that only uses flash memory (No tape). As an avid video enthusiast, I would be using it for personal use now but could use it for business uses in the near future.

1. For those of you who have a Digicam that meets the above requirements, can you make any recommendations as to which model(s) I should consider ? I previously bought a Panasonic HMC-150 for the office and it's OK but it doesn't seem to perform too well in low light and I also perfer the layout of the controls on the sony models better than the panasonic models.

2. I have initially been looking at the HXR-NX5U but am open to other suggestions. Anyone recommend/not recommend this digicam ?

3. I read about problems with the HXR-NX5U on this forum such as things happening suddenly in the middle of taping that causes lost footage. Is this camera problematic ? Do you recommend Sony's extended warranty ? Are these cameras generally very durable ?

4. The one thing I like about the Panasonic HMC-150 is that it has a built in waveform monitor plus other diagnostic displays. Do any of the Sony NXCam's have any built-in features that are similar ?

5. I noticed that Sony offers cameras that use different solid state media such as SDHC cards, Compact Flash cards, and SxS cards ... Is there any advantage/disadvantage to using SDHC cards vs. Compact Flash Cards ? I was always concerned about using Compact Flash cards due to the many pins that seem fragle and problematic to me.

Thanks for your input.

Tim