Yeah, it's really tough. I always try to hang out on message boards and listen to what people are saying about their cars.
http://www.srtforums.com has a "problems" forum and I always read that to look for patterns and any TSB's that are released.
I've done the same thing on NASIOC and clubwrx.net
Honestly, I'm not 100% sold on the reliability of the Dodge. They've had problems in the past, but everything looks solid on the SRT-4 for the most part. Unfortunately, I guess only time will tell.
If it were me, right now, I'd probably focus in on the WRX and the SRT-4.
Another thing I've considered, is the quality of the dealer service departments in my area. If I've got a good Subaru place within 5 or 10 miles, but only one really crappy Dodge dealer within 50 miles, I'm not gonna feel real good about taking my car to a bunch of idiots in the event something does go wrong.
If you are interested in mods for any car, make sure your dealership service dept is cool with them (don't even bother asking the sales guys). Technically, the Mopar parts such as the various staged kits and suspension stuff *is not* covered under any warranty. So, if your Mopar Stage 1 upgrade is determined to be the cause of engine or transmission failure, you're SOL.
It seems that some folks have found dealerships willing to warranty the Mopar stuff *if* they install it. Some have even put it in writing.
I don't think I'd be comfortable doing any of the Mopar upgrades to the engine without something in writing from the dealership that they will not void any part of my warranty by installing the parts.
So, yeah...more rambling. Finding a competent and mod friendly service department is a plus.
As you can see, I've got some time on my hands AND I'm slightly obsessive.
Edit: Rumor has it that '05 SRT-4's and probably some of the other SRT vehicles will lose the 7/70 and get only a 3/36 on powertrain due to blatant warranty abuse, ie. doing a **** load of mods to the engine, breaking something and then returning it to stock so it can get fixed under warranty.