The TF is available right now on TigerDirect.com for 299. That with the 100 deals on the dock gets you with the whole rig for about 400. You will be at 650 for the prime minimum to get the whole rig. That's a no brainier to me the OG TF has had the kinks worked out and is getting ICS shortly.
Get the older TF and take your 250 of saved (earned) cash and eiher buy something else that you want, pay down a credit card, put it in savings, play it all on black at roullette (sp?) - anyone of these is a better investment than blowing more than 150% of the cost of the TF for a processor upgrade and way more bugs.
Unless you are one off those people who craves the newest and "bestest" regardless of the cost - the value here is definitely higher for the last gen. I am a big fan of always trying to get one gen back hardware - it works better and other people have paid the new adopter tax.
After stating this, I will add that i do not always follow my own advice as I bought the TF when it had only been out for a few months - but in my defense there was no older generation to get at the time.
You gotta make a decision that you can live with, but I just thought I would paint a slightly different picture for you.