There is a phrase that goes "a X of riches" which suggests that one had so much to choose from, lots of good choices. What is the missing word?
I've heard the expression a wealth of riches to mean an abundance of choices or appealing options, such as found in these examples:
...in the region of Tuscany, a region with a wealth of riches for the keen cyclist, culture vultures and fun seekers. (1)
The music is bold and epic, which are attributes you'll pick up on immediately. There is a sense of might behind many of the tracks as the rich orchestral sound plays to great scope and the choir fills the speakers with startling beauty. Thankfully, Excelsius is far from being one dimensional; it offers a wealth of riches that will appeal to anyone who enjoyes a great film score. (2)
Explore Minsk, Belarus's modern city, built as a memorial to the glory of Soviet communism or step beyond the capital and find a wealth of riches that remain largely unknown to the outside world: the natural splendour of primeval forests, rivers and lakes; flora and fauna in abundance; stunning museums empty of visitors; rich culture and tradition; historical sites dating back to the Middle Ages; beautiful churches... (3)
Team Canada: A wealth of riches
Mike Babcock's greatest blessing as head coach of Canada's 2010 men's hockey team is also his greatest curse: Being positively spoiled for choice. For head coach Babcock, executive director Steve Yzerman and the rest of the brain trust, the quandary is choosing the 23 that blend the best.
There's plenty of choice. Smyth or Staal? Green or Bouwmeester? Fleury or Ward? Either way, any way, it seems they can't go wrong. (4)
If the number of choices seems almost too great – enough to cause the fortunate one to perhaps blush – there's also the idiom embarrassment of riches.