I'd hunt for a good deal on a GNS430W, Sandel 3308 (and King or better yet Sandel remote gyro set), the PS 8000 seems like the folks top pic, I have the Garmin 340 and I'm very happy with it, just have a 3.5mm jack wired into comm 3 for iPods and whatever.
I'd recommend a TRRS jack, gives you both input for music and output, for handheld radios, go pros, cells etc.
http://www.kvconnection.com/product-p/km-161-5435.htm
Spending that money on avionics without a HSI is silly.
I take it you already have a autopilot.
By the time you buy a gyro and a Sandel you buy an Aspen.
If you get any of the Garmin WAAS boxes, get the Blue Tooth link for them so you can control them from an iPad.
I would be hard pressed to own another plane without a glass SVT deck, it would have to be something with a Day VFR only mission, and that just isn't me. Even though I rarely fly IFR, I know my planes have to be IFR, and Class G VFR minimums capable, because I run into it getting places I need to be. Even if all I need is the first or last 15 minutes to be IFR, it's hard for me to pass it up, especially since when I need it most is likely the when I am at my least proficient, and that is when SVT pays for itself.
I was fortunate enough to have made friends on the Red Board with a gentleman who has not spared a dime on his Comanche and has constantly upgraded his panel, (his avionics shop gives him a decent deal, basically they trade it back for what he he paid on the upgrade, less the install cost the of course; he had an Aspen for a few weeks.
) from a King HSI to a Sandel 3308 to a Sandel 3500, to an Aspen, to a G-600 driven with a 530/430 stack now has an all glad 2xG-600 750/650 with all the integration, a stand alone small SVT unit as backup and a nice digital engine primary package. The only round left is the flap indicator.
All through this process he has always kept me in IPCs in his plane, and it ruined me. When I saw step by step how much capability and information each improvement provided, especially when the crap starts getting thrown at you, it was really impressive. I've always been fine after 10 minutes or so even after a decade of not flying IFR as for controlling the plane, however the mental gymnastics of situational awareness in IMC isn't as fast, and in fact it is impossible to maintain SVT levels of situational awareness while flying a six pack in IMC, there just is enough time unless you know the airspace and terrain like the back of your hand. I can jump in Av's plane and be perfectly comfortable punching direct into the soup. So, when I got the 310, the first flight dropped it off at the avionics shop for a G-500 an 430W (no 650/750 yet or I would have bought a 750, the screen real estate is worth every dime), that I got to fly into Stead for the air races was a bonus.
