Things to remember ... the "Sandy Bridge" releases slated for Jan 5 are Core i5-2500/2500K, i7-2600/2600K with the 'K' versions being more readily suited to overclocking than their un-'K' counterparts. These are
direct replacements for the current Core i5-750/760 and Core i7-860/870. That is ALL that is being released
at this time. If those are not your target CPU's, then you have a much longer wait for anything else. And we are talking 200-300 dollar CPU's here.
The decision of course is motherboards, as the "Sandy Bridge" 1155 sockets will not be compatible with current 1156 socket boards and chips. Since price seems to be a factor for you, I would suggest that you are good for a few years yet with the 1156 socket boards and prices will only come down for both the boards and the CPU's. That becomes the best reason to wait another week or so as current 1156 tech parts will
likely see a price drop.
Is there a reason I should not go with a temp I3 on a MB
versus an I5.
No reason at all for Aces High, browsing, mail, HTPC etc. In fact the cheaper the better. A squaddie recently ordered the Core i3-540 (3.06 GHz) and it flat out kills his older 2.8 GHz Core 2 Duo. I would suggest that even the Core i3 530 @ 2.8 GHz would be fine.
AND, is there a difference in Aces High using a Dual Core versus Quad Core?
For Aces High and most other general tasks, little to none. The Core i3's are fast out of the box and will overclock like crazy. (with a good replacement cooler). I could be corrected, but I highly doubt Aces High will make full use of 4 cores in the first place and so ultimately you are better off with less cores that are higher clocked.
Skuzzy has stated that the onboard vid is bad, my question is How bad
This will be one (of many) of the benefits from Sandy Bridge. The reviews I have read state that there is a huge improvement in on-board graphics that will effectively eliminate the need for $100 or less cards. Is that enough to play Aces High really well? I'm not sure, but I'm skeptical. Hands on I guess, will be the true test ...