So for the first time I'm tracking a band that plays solos and I'm wondering what kind of processing you guys like to use (like delays, reverb, other FX, etc) to spice these up? Thanks in advance for any help you can offer 

this, solid advice, AND most important: be really (really!) anal about the cleanness of the tracking, nothings worse tha na muddy solo with missed notes and bad articulation, no matter what you do it will always sound crappy as hell, if the guitarist can't nail it play it half as fast and then cut it note for note, when thinking about this topic i always think of the phrase "often a lot of work is wasted because the lack of a little more work"Delays are utter win on leads man, they're essential really to prevent them sounding dry and one-dimensional. Go easy though, and you really don't need that much in the mix, like 15%~. Reverbs also work nice, but again subtlety is key. It's really easy to over do it and get the notes bleeding into one another, especially on faster runs.
I tend to LP leads a lot lower than I would rhythms, sometimes as low as 6k. Gives them that nice creamy mid-heavy vibe that makes them stand out, and clears a lot of unnecessary frequency range. I usually finish off with a limiter on the lead bus, to even things out.
here's what i do:
Mathematic calculations to find the exact lower and higher note of the solo in order to use high pass/low pass filter.
this is all very helpful stuff, thanks guys
how long of a delay do you use? 1/4, 1/2, whole note to tempo? feel it out til it sounds right?