I'm currently looking for a new preamp also, and have been researching and testing out units for the past two months. I've budgeted about $1500 for it, and let me just say, I might just go for the RNP (Really Nice Preamp), which goes for $475. You'd really have to go over $1k to get a noticable increase in quality. I'm not certain, though; I still have to hear the Great River pre, but RNP is definitely among the top few in my search. I've tried out all the Presonus' and Focusrites in the $300-$1000 range; they barely beat the pre's on my mackie VLZ mixer. The built-in compressors and vocal-specific EQ's on those channel strips hype the sound a lot, but shut all the effects off, and you'll hear some pretty ugly pre's.
I haven't tried the SPL GoldMike, but that looks like a very good price considering it goes for about $900 here. A word of caution, though: I hear it's a real "character" box, and sometimes "warm" and "vintage" sounding pre's aren't the best for dense mixes, such as those in most types of metal. If you can demo the unit first, do it. And let me know if you do, because I tend to like "character" boxes for soft vocals, and might consider checking this out.
What type of mic are you pairing your pre with, btw? That makes a huge difference, as well as what you'll be using it for.
***(all prices in this post are US dollars, btw)***