[Elecraft] K3 upgrade advise

[Mike Weir]

Soon I will be placing an order for the KSYN3AUPG board for my K3 and at the same time since the rig will be apart try to order any other upgrade mod's for  the rig. One mod I was looking at was I have REV C DSP board and see that I can add K3DSPLPF board. Does this board offer any other enhancement other than a LPF to roll off the RX audio above 4 KHz?  The Serial number of my K3 is 3619 it no longer has the Sub receiver and is the low power model at 10 watts is there any other upgrades I should consider? figure may as well order them all at once save on shipping. 
Thanks in advance 
Mike Weir
VE3WDM