+1 on increasing your tire pressure (check your pressure regularly & keep them inflated)
Looking at the specs for the Allant it looks quite similar to my commuter bike - it came with pretty low end OEM Kenda 700x35c tires and I recently replaced them with a Schwalbe Marathon 700x32c which, with the narrower tire at higher pressure, improved the feel of the bike IMO and was a very affordable "upgrade".
You may have to experiment a little yourself to get what you're looking for. (BTW -MEC has some really great prices - eg my CO2 inflator - and some not so great prices - tires are way cheaper on-line)