Preferable 3800 and 2920 Procurve switches setup

We have one HP Procurve 3800 acting as a backbone and seven 2920 used as "branch" switches.
All 2920s connected to the 3800, each one with one CAT6, and this actually gives us only 1 GB link between the "branch" switches and the backbone and also creates single point of failure if the port dies.
On 2920s we already have stacking modules allowing us to stack up to 4 switches in one stack.
It is impossible to stack different types of switches together

What would be the best setup to achieve the best possible performance of these switches?

Thank you!
Vasilax50Asked:
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eeRootCommented:
You would want a second 3800 to serve as a secondary core switch.  Then connect each 2920 to both 3800's using link aggregation (Two 1Gbps links).  This will give each switch redundant 2Gbps connections.
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