Hey, I'm another SP-606 user. As my first sampler it was a great learning tool. Pitch was never even a problem until I started collecting other samplers. If you've got an ear for tones or a guitar tuning pedal pitch shift is needless. Just find another sample in the same or relative key.
The limitations in SPs actually make writing music simpler & faster, there's dudes with SP-303s & 404s who can turn out incredible bits of music in an hour or two. The key is to look at the SP series as workaround machines. By giving limited particulars (ie- polyphony, pitch) & loads of extras (40 FX, sound card, DAW controller) you really start thinking about the 'why' & 'how' of your workflow. Resampling is the key.
I've tried messing around with an MPC500 & I can't do anything near what I can with my SP. Maybe I just need more practice on it, maybe I've been trained by the SP to work in a particular manner. Either way, the SP-606 is slept on gold.
The song in my signature block is an all SP-606 joint.
SHAMELESS PLUG TIME:
Ill Green & I are members on the SP forums, we can both vauch for there being some dope producers on it. A bunch of members all pitched in to put together one hell of a beat tape. It's all video game sampling & all produced on Roland & Boss SP series samplers. For an idea of what those machines are capable of, check it out here:
http://spforums1.bandcamp.com/Here's two clips from the tape: