Hello
For a pump.. go Liang D5 with speed control.
Koolance has a version with RPM monitoring. The D5's are pretty much dead silent when run under the speed setting of 3 and are super reliable.
3/8th ID tubing is more than enough .. there is very little to no difference with fatter tubes. Also 3/8th ID -5/8th OD has a really good bend radius to boot
What would help is if you can give us a budget to work with then we can start to recommend blocks and such
Cheers and kind regards !