You want redundant power supplies, you want to keep load below 60% of the total rating of the psu
You're only getting 8 cores with this, so I'm not sure you'll be able to run many bots. I feel like 128gb of ram is overkill for 8 cores. It feel like 1gb is enough for 1-1.5 bots (each osbot client instance) but my scripts are not fully optimized. My experience with a poorly coded script running off a dl360 g7 w/ xeon 2560 I made using heavy amounts of webwalking: 1 core is enough for 2-2.5 bots. However, that is at max load. I prefer to try to keep stuff at half usage. Currently I'm refactoring my code to use PathWalking, which has pretty much evaporated high CPU load, but I am not done so no benchmarks yet
Have you considered a dual socket or quad socket server? why the ml350? I think I'm gonna get a quad socket unit
IMO 700 euros is too expensive, a g8 proiant server I think should only run you a few hundred