Infiniti I30
It was a great car; I bought it with 40K miles, and drove it until 103K 2.5 years later (long commute). The main reason I got a new car was that the air conditioning compressor was going ($$$) and I would need brakes soon.
Protege5
Nothing yet, but I've only had it for 7 weeks.
Infiniti I30
It was plenty powerful, comfortable, but took Premium fuel.
Protege5
This is the best-handling car I've ever had (and I've had a couple that were pitched as being "sports cars"). With about 30 more horses, it would handle even better (for powering out of curves), and the car could definitely handle it. The SportAT lets you have about 75% of the fun of a stick, but the convenience of automatic (for when your mobile rings).
I agree with the comment about the Sportshift Auto transmission. It responds quickly on command and allows control of the engine revs. I drove an Acura CL 3.2 with the same type of Auto-Manual transmission and was surprised at how much slower it responded to shift lever movements. It wasn't nearly as fun to drive; despite having more power. That really made me appreciate my Protege5.