Buy the Q 320 and don't look back!!!!!!
The Q 320 comes with a stand, a warming rack, and a handle light. It puts out 27,000 btu's. and has the Weber name behind it. I own a 300 and a 320, but to upgrade the 300, you are ahead getting the 320 that includes everything. Cast iron grates that do a mean sear on a steak or fish or chicken. To cut down on possible flair ups, I use my GrillGrates on the Q grates. Works well. 10 years from now, guess what??? You will still be able to get replacement parts. If you need them, although I doubt you will need to as the Q320 is built very well.....