I sounted out what I want done, there are 451 slides. Scancafe can do that for $330 (4000 dpi, JPG+TIFF, dust/scratch removal)
For my time, I'd rather spend $300 than 100 hours! And as long as they come back as TIFF, they can essentially be treated as RAW and manipulated in ACR.
I have never used scancafe and cannot speak for them but for that many slides it seems like that's kinda a low price or will have a ridiculous turnaround time... either way i'd err on the "if it sounds too good to be true..." but it it works out well and doesn't look shabby, more power to you.