Cost of Garmin 300XL installed vs. GNS430

Does anyone have recent experience getting a Garmin 300XL GPS/COM
installed? I'm trying to figure out the comparison in price between the
430 and the 300 when it comes to the total cost of the installation.
This will initially be a VFR only installation, but I want the GPS to
be IFR capable so that when I finish upgrading the rest of the panel, I
don't have to get a new GPS. I see factory refurbished 300Xls selling
for about $2700 which is significatly less than a 430 costs.

Any recent experiences with installations on either the 430 or 300
would be appreciated.

Thanks,
Eric