Paul
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Vivek,
all depends on the important specifications of your design. If gain is more important than raw speed, you will anyway want to avoid using minimum channel length. Excess thermal channel noise is among others related to velocity saturation, which mainly happens in deep sub-micron technologies. I am not sure this is so critical in the technology you are using.
If your devices happen to work in this regime, you may experience excess thermal noise, but also reduced transconductance (thus less gain and gain-bandwidth). For this reason, except when you are working at the speed edge of the technology, it is always preferrable to avoid minimum length devices in the amplifiers.
Paul
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