Choose one with 2 rows of at least 1" tubes.
Make sure it has a lifetime warranty.
A lot of the ebay and amazon brands are cheaper because they are cheaper aluminum and no warranty. I'd be glad to help out and offer a deal on ours to cut the gap between them. PM if interested.
How to send an PM on the new sight, Bruce
PM's are now called "Conversations".How to send an PM on the new sight?