Plexi is weaker than MDF, so you'll need thicker to keep the strength up.
That being said, it's extremely expensive, just so you know. My 12" x 12" x 3/4" panel was like $150 shipped or something crazy like that. It is extremely nice though, and definitely no joke. When I called the company (can't remember the name) they said if I would've bought more towards a whole sheet, the price would've went down, since it's less odd pieces that they have to sit on and try to sell.
If you're buying a big, standard size and cutting it yourself, check out mcmaster.com (McMaster-Carr). They're a great site, but not flexible on sizing and such. Just google it, and I'm sure you'll find the place I did. I'll look for my receipt when I get home from work today and post a link if I can find it...
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Ohio Bass Society
Team XS Power
2010 120-129.9 Bassrace World Champion