If you want a 2x512mb kit, then any TCCD is probably best (OCZ/Patriot/G.Skill/Corsair). High voltage stuff like BH-5/UTT has known issues with these DFI nF4 boards due to a VTT bug in the boards. However, I do believe those issues were fixed with the Expert version.
If you want a 2x1gb kit, then any Samsung UCCC(G.Kill HZs), Infineon CE-5/6 (OCZ Plat EBs/Patriot 3500LLK), or Micron. Can't remember the model on the Micron ICs but they were in the
2x1gb PC4000 Ballistix. However, those first revision Ballistix had issues and many had to RMA.
Also, a lot of these kits aren't easy to find anymore... almost none are available for purchase. UCCC is generally characterized as PC4000 w/3-4-4-8 timings. CE-6 is generally characterized as PC4000 w/3-3-2-8 timings.
Here's what's available @ the Egg right now... slim pickin's IMO.
http://www.newegg.com/Product/Produ...Subcategory=147&description=&Ntk=&srchInDesc=