push plus pull on any slim radiator will outperform any premium rad with push or pull only.
When talking about 1300rpm and slow speed fans IMHO save your money and buy cheaper fans. Something like yate loon slow speed or Helix or Artic Cooling F12s are every bit as good as the Noctua fans and can look better in black or white. More importantly, $5-$10 per fan canget you push plus pull much cheaper.
As far a CPU/ GPU kit, you don't really need much pumping power for that, something in the 6-10 watt range is plenty. You could go with an H220 or XSPC kit for a good price. I am in the process of testing both, currently working on the H220.
Which kit depends a little on what radiator or radiators you can fit. I would generally recommend a 2x120 for CPU 3x120 for CPU + GPU, but you can also add more than one if they fit in your case. For my kit testing, I am figuring on 2x120 then add a 3x120 in the Switch 810, that should be plenty for multi GPU etc.
Stay away from motherboard blocks or other high restriction stuff and either kit pumps will do fine.
If you are trying to decide between RX vs EX vs RS, the RX is slightly stronger than both EX and RS. RS is more high speed fan optimized where the EX slightly tune for slower speed fans. Difference is fairly small though. Push plus pull on either the EX or RS will perform better than the RX in pull or push only.
Hope that helps, if you want to know more about the kits, I am working on them at my blog.