cisco may provide you some san fabric sw's but for storage disk arrays you must try EMC2 or HP and it important things to mention how much space you need,you may also try a start up package from HP, they provide everything you need to build a small t...
i had the similar case with 3com super stack, try to change your NIC speed from 10 half to 100 full duplex,if you got better at speed, keep 100 mbps for those two system, however don't think so its speed mismatch problem.
