having started with high school architectural drafting tools (#2 pencil), then starting with CAD in 1988, i've used a spectrum of tools, including the dual-xeon workstation+FireGL that corporations tend to provide.
the computers you will buy will be faster than all but one of my own computers (i also run Solidworks & 3D Max, among other programs).
and, the students will be thrilled, and learning - that's the main thing.
i would suggest as one possibility, systems based on AMD's cheap 4 core, the Propus 620/ 630/640 etc. series.
http://www.newegg.com/Product/Produc...82E16819103871
AMD Phenom II X4 940 Black Edition Deneb 3.0GHz
$100
Newegg has combo deals including a motherboard.
http://www.newegg.com/Product/Produc...Size=10&page=1
for hard drive, the Western Digital Black 640GB or the Samsung 103SJ 1 TB drives are both great.
for monitor, a 19" monitor will be enough for Solidworks (screen space for tool menus + viewport).
for 3D Max, a few more pixels would help, to support the standard 2x2 screen display + menu's.
but you have enough money in your budget to get some decent 22" monitors.
PLUS - since you're a school - there's a chance you'll get some good discounts. though Apple discounts won't help much ... Solidworks doesn't run on Apple OS without work-arounds that might be a pain in the ass.
anyway, with that budget, you should end up with 4 educational workstations and some very happy students.