I have an airways approved Archer and faced the same choice as both DI and AH were showing their age. Given that I'm also Instrument Rated I wanted reasonable reliability for the few occasions that I operate IFR. Since those are infrequent the cost of twin G5's and the requirement to add a Garmin autopilot made the economics a simple choice. I replaced the drive shaft on the vacuum pump (actually a Tempest Service requirement) sent both instruments to the company linked above and in total spent less than one G5 would have cost.
Also, as previously mentioned. When you were trained to fly six packs in a previous age the G5 is wasted as your scan still rotates around the panel. If you want the 'EFIS' experience go Aspen, then you can really spend some money!