Any opinions or comments about an "easy way" into this? Would it be satisfactory to acquire a used GTX330ES (or 330 then pay for the upgrade) and a used 400W/500W/430W/530W? I see that 330's go for 1-2AMU's (depending on ES upgrade) and I have seen 400W's for as low as 3AMU's. I know that the GTX345 has AHRS and Bluetooth, which is nice, but that individual device alone is more expensive than a used 330ES+400W installed. I have an SL30 nav/comm now and could add in a VAL COM2000 to account for the loss of the 300XL's comm feature.