Veeam reporter is pretty good - http://www.veeam.com/vmware-esx-reporter.html
Though I must admit, I tend to script these sorts of reports wherever possible and save a few pennies for more exciting things.(may be tricky on 100 servers though)
If I were you, I'd get hold of the guys at Veeam - they are pretty good with doing demos and the usual presales stuff. They also normally bring a 'proper' techie along - so you can get low level answers pretty quickly.
With an environment of 100 servers needing reporting . . I am sure you can get them on site pretty quickly.
At the same time, don't discount any other vendors.
Age old art IT negotiation . .
- Find all the Vendors
- Get them all to show you their product
- Evaluate all products (perhaps get some freebies while they try wow you)
- Pick your favourite prouct
- Find their biggest competition
- Tell your vendor you are going with product 2, because product (even though it is your favourite) is too expensive
- Watch the price drop 50% (most I've seen is ove 90% discount)
- negotiate a little while longer (while running the product in 'eval' - with the best support you're ever going to get on the product)
While 'evaluating' - make sure to dial the normal support lines to check out how product support is etc.
Good luck and please post back with the results of your research.