You should still be able to run that site on a VPS thats optimized no problems asked.
Who is your current hosting provider? I've used PowerVPS in the past, and their mid-range VPS easily supported 150-225 users online at a time with pretty much the same modifictions you've listed and a few more.
If you're able to optmize your VPS, have you tried doing that let? Sometimes it'll help fill the gap in between needing a VPS, and needing a dedicated server.
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