I just picked up a virtually new 'refurbished' camo-finish M98 Custom Pro for $110 from ebay. It comes with an upgraded barrel, double trigger and drop, and accepts an e-trigger kit. My 98s and my Alley Cat are the only blowbacks I ever still use at the field over my 'better' guns. I'm looking forward to trying this one out at next weekend's scenario game with the e-trigger, Cyclone, lightened hammer and Flatline I threw on it.
So yeah, 98. It's a 'beginner' gun that can be upgraded to keep up with the 'good' guns and if you don't mess with it, it'll never let you down.