Andrew, ended up going with a LiquidWeb Dedi.
NOTE: added 8/4/07 Cancelled LiquidWeb - BADDDDD EXPERIENCE.
See this post on next page.
I decided and was told by lots of people a VPS just wouldnt get it with this forum load and WP which is pretty resource intensive too.
Got a X2 Dual Core 4600+ with 4 GB Ram and two 160 GB hard drives plus offsite 50Gb backup. Went with LW for lots of reasons. They are like RackSpace as far as very solid rep but not quite as expensive as RS and they have own datacenters and a good 10 years in biz. I called support like 4 times today with questions and I kid you not every time the phone was picked up before the 2nd ring. So fingers crossed!