I've been struggling with ordering my new MBP due to the SSD issue. It's "only" $180 to upgrade to a 128 GB SSD BTO. Ever since the massive SSD sale NewEgg had last week (wish I had ordered then!) even "baseline" 100+GB SSDs like the 120 GB Agility are >$300. Granted, I'd have the HDD leftover for a backup disk or Optibay, but I'm not interested in either of these solutions.
What I'm most concerned about is if the new SSD options are any different, performance wise, than the old (slow) offerings. Slow = spend the extra $120+ on aftermarket. Decent = tossup. Fast = BTO.