Spend the extra and go with the 62's
There's a reason he's upgrading to the 62's. The 62's are outstanding in bass reproduction. You need that 6.5" driver for adequate bass. The tweeter is also larger, and can handle a wider frequency range with more efficiency. I'd hold off on that purchase, and go with the 62's all around with the 62CLRS center as he is most likely doing. You won't be disappointed. The 52's are fine for surround, but won't hold a candle to the 62's IMHO.