Of medium size and importance, neither top-tier nor bottom-tier(adjective)
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Use "midtier" in a sentence
"“Much of the smartphone growth during the first quarter of 2009 was driven by touchscreen products, both in midtier and high-end devices,” said Roberta Cozza, principal analyst at Gartner."
"Younger people are shifting to living in separate households and retirees are continuing to stay in their apartments, resulting in a shortage of affordable midtier housing."
"Although touch for touch sake drove the midtier space, high-end handsets will require integration around music, e-mail and Internet browsing, according to Gartner."