thinking hard about ordering a new 706mk2g. what exactly is the high stability crystal osilator option.????? this is going to be a 10 thru 12 meter ssb used rig for me so is this nessisary.??? worth the money.??? is it a plug n play deal or need soldering in.??? im going to get the 1.8 ssb filter but cant really afford much more than the radio and the filter for right now.