I'm looking for suggestion: need your help in choosing between vpsland.com or zipservers.com? Maybe you have some experience with any of them?
Which one can you recommend to go with and why? Thanks

I have never dealt with them. But doing a self research will be much beneficiary. Reviews may be available here or in other hosting forums like this.

I have never dealt with them

Sure, because you are web hosting provider Matt
Read reviews on them on the WHT, maybe it worth to ask about test account from them. I believe that would be reasonable.

I also have no personal experience with either company. However, I do have a lot of experience with SoftLayer (zipservers Server provider). The network and infrastructure system Softlayer has in place is the best there is for VPS hosting. For that reason, I say zipservers all the way.

I have no experience with both companies you mentioned.
I suggest you not to be so confident in choosing company and compare them with the others, for instance, MMhosting.com and Inmotionhosting.com. I would like to mention that their long history in this business gives the reasons to treat it as the companies with highly redundant servers and quality support.

You know the comparison research give you the right answer. For this, I recommend you to check out A2hosting.com as it has abundance hosting packages. You can send them support ticket and see how fast they will respond and help you to find configuration you need.

I think that he is trying to find out more information about both companies, and he is not interesting in others.