I just purchased tickets for my two daughters and I to go and I found that the HP Pavillion has a feature on their site that allows you to get a "view from your seat." I agree with Sharks that there wasn't a "bad" seat, but this is also doubling as birthday presents for my daughters, one of which will be turning 9 on the final day of the trials. We opted for the $525 seats.
The $525 seats have the added bonus of a "gold level" program and gift, for what it is worth. I was actually considering the platinum level seats because you get a meet and greet with the gymnasts, but the extra $1,200 was hard to swallow. I explained to my girls that they should bring a poster or leos and sharpies just in case they have the opportunity for autographs, but no guarantees.
We booked last Thursday, the day before tickets went on sale to the public via a code provided from our gym. We also booked our room at the Arena hotel at the same time. It is 2 blocks from the pavilion. It is geared more toward convention goers, so no pool, but I figured we may not need a rental car that way. We got a deal on the room when I mentioned we were coming for the trials, and the people were very helpful.