Ive been in touch with the Jaspers guys and they seem geniunely passionate. Problem is that every single time that I have tried their coffee it has tasted decidedly stale. Not as tragically stale as supermarket coffee, but probably a week or two past it. But you probably cant actually notice this if you are getting your coffee preground.
If you are going to Jaspers in Brunswick st, you might want to cross the road to Cafe Atomica. Their espresso blend is a darker roast, that may or may not strike a chord with you, but it is always fresh enough to be in the zone when you buy it.
There are only two places that I keep going back to for coffee. One is St Ali (http://www.stali.com.au/), which is a micro-roastery/cafe run by a really passionate guy who decided that he was going to really push the boundaries. Just ask the staff for their recommendations. If you like a sweeter, north-italian style of espresso, the Daterra Reserve is really impressive, but they always have heaps of great single origins and a bunch of blends. The second place that I keep on ending up at is Veneziano Cafe (www.venezianocoffee.com.au), who are a much larger commercial roasting concern, but always maintain freshness. Theyre just around the corner from my house, which is very convenient for when I have forgotten to roast!