Sorry to respond so late. Peoria has long been a national test market so they get outlets of chains before they go national, not a lot of indies but some are:
Lariat, a classic steakhouse at 2232 W. Glen
Fish House at 4919 N. University
Vonachen's Old Place at 5934 N. Knoxville
Some of the old standby's like Jumer's have changed hands so I have no idea what they are like now. As far as being near downtown, Peoria isn't a very big town, nothing is too far. Downtown area has Joe's Crab Shack and the like along the river.