Couple of points to watch:
1. Some of the HP scanners I've used take up to a minute after "pressing go" before anything happens. That may be part of the "Intelligent Scanning Software" that works out what to do - and takes an age doing it. Seems to be a function of the "three buttons" feature.
My old clunker SCSI Agfa (several years obsolete) is very fast by comparison. Click "scan" in Paint Shop Pro or MS Word, and the scanner head starts moving instantly.
2. If you want to scan in text (OCR), then expect to pay a fair amount for capable software. The cheap end of the market gets very frustrating if you do much OCR.