There is an easy answer to this, and it's more complicated than "the Ralph." The answer is the WCHA. Basically every rink in the conference has had major renovations recently, or is brand new in the last ~ 20 years:
Minnesota-Duluth - Amsoil Arena: ($80 million) opened December, 2010
Bemidji State - Sanford Center ($45 mil) opened October, 2010
Nebraska-Omaha - Qwest Center ($291 mil) opened 2003
North Dakota - Ralph Engelstad ($105 mil) rink opened 2001
Denver - Magness Arena (part of an $84 mil) complex opened 1999
Colorado College - World Arena (part of a $59 mil complex) opened 1998
Wisconsin - Kohl Center ($76 mil) opened 1998
Minnesota State - Verizon Wireless Center opened 1995
Minnesota - Mariucci Arena opened 1993
St. Cloud State - National Hockey Center opened 1998 ($32 mil renovation scheduled to start this off-season)
Alaska-Anchorage - Sullivan Arena opened 1983*
Michigan Tech - MacInnes Student Ice Arena opened 1972 with major renovations in 2008 and '09
* the only rink to receive no major renovations in the last ~ 20 years.
No other conference can remotely compete with that list, and that, IMHO, is part of what makes the WCHA the top conference.