Which server should i choose

You've asked a question that doesn't have a right or wrong answer. I haven't used Acer or IBM for several years. I been purchasing Dells for the past 6 months and they've been OK. The real questions are: what are you going to be using the server for? Do any of these have the features you need for what you plan to use it for? (An example, I purchased a Dell 1400 to use as a Citrix server, I purchased a Dell 2500 with an extra power supply and six raid 5 drives to use as a file server. Different servers for different jobs). The next big question is: If you are buying the server for a business, what other equipment is there? If you have all HP PC's, buy an HP server. Or, if all your other servers are Compaq, buy Compaq. The point is, you don't want to mix your servers or PC's if you can help it. It's far eaiser to maintain one brand of servers and one brand of PC's. Stick with whatever you are using now, or whatever brand you plan to move to.
Hope that helps.

none of the above - go with the Compaq Proliant line - you'll be much more pleased than with any of the above all the way around. You can get them rack mounted and they have a really sweet setup - you can get
environmental controlls in the cabinet all kinds of neat stuff.

I'm biased.