I read your post with amusement. I ask myself, do I care what some knucklehead says who obviously doesn't know that of which he speaks? Not really but let me enlighten everyone else. The Ford GT has a well known and finite list of issues that anyone who owns or "works on this crap" knows about. You mentioned none of them. For example:
Weak factory half shaft bolts.
Cooling systems that need air purged from them and some fan engagement temp adjustment to keep them from running a little warm.
Electrical systems that will drain batteries if they are not kept on a trickle charger when parked for more than a couple three weeks.
Gauges that will randomly fail and cost several thousand dollars a pop to replace.
Speedy sleeve and a-arm recalls.
Painted area where the battery chassis ground is located that will mimic a dead battery.
I think that pretty much covers most of the common GT problems. If you did work on them you would have mentioned at least a couple.
What is not an issue is the chassis or engine. The dry sump 5.4 is not even close to the 4.6 engine found in the pickup. It has proven to be reliable to over 1000hp and 20psi+ boost without even lifting a valve cover or touching the long block. Vipers will start chucking rods past 7psi and 750hp. Not even close. The GT is also a dry sump oiling system, proper for a true track car unlike the Viper's wet sump oil pan which under cornering causes oil starvation. On another note Vipers are becoming a dime a dozen and prices are dropping like lead so they may be more in line with your price range than a GT I don't know. I've driven Vipers and they are fun albeit not nearly as refined as the GT. They shift clunky, clutch peddle requires a lot of grunt, and they steer heavy. GTs are double disk clutches that have the peddle pressure of an Acura. They shift like a hot knife through butter. The steering a very precise with great feedback. Two entirely different cars. I don't care if you want to bag on GTs but at least have a clue what you are talking about. Carry on...