I tried the Philips 5R4GYS rectifier in my CSP but it was one of my least favorites. Very detailed, but too bass-shy and sterile.
RCA 5Y3GT and EML 5U4G meshplate have been my favorites thus far (surpassing Tung-Sol 5U4G and 5Y3GT, Sylvania 5U4G and 5Y3GT, RCA 5R4GY and 5U4G, and yes even the lush Brimar 5R4GY).
If you like the Philips, have you tried the USAF-596? It is similar in regards to detail retrieval, but with better bass and midrange IMHO.
+1 on the 596....I am pleasantly surprised at the Valve Art 274B too.