As the thread says, iam wondering this becuase I will be upgrading my computer within the next week/ couple of days, I cannot decide if to.  
 
1. buy 2 3870's http://www.overclockers.co.uk/show [...] =GX-079-PC and use them or.
2. Wait for the new 3870x2 thats out next month or even
3. get 2 8800 GT and put them in SLI, they might be better.  
 
I cant decide especially between 1 an 2 as I dont want to fall in the trap of waiting for the next best thing but then there is the risk that 3870x2 will kick major ass. any thought?

Get 1 HD 3870 now, if you need buy a second one later.

hmm could.Although looking at the benchmarks for games i need to have crossfire to get decent FPS in the most demanding games such as crysis

What games do you play or hope to play?  What resolution?  What are the system specs of your new future build?  When playing the latest games at higher resolutions and enabling fsaa, then crossfire or SLI can help alot.  For instance, dual 8800GT allow me to play Crysis at 1680x1050 all high details with 2xaa/16xaf with a little more performance than a single 8800GT without aa/af at the same settings.  To me that makes it worth it, to others it would not be worth it.  Go beyond that resolution and crossfire/SLI scale even better.  And I don't see anything wrong with any of your options unless a particular game of interest to you scales or runs better on ATI or NV.

i hope to paly all the latest games on their best setting possible and future games at ver decent setting.  
 
I use a 19inch widescreen monitor at 1440x900.  
The future build will proably be  
 
Intel E8400 Wolfdale
4GB of 6400 RAM 4-4-4-15
Asus P5E Intel X38 Motherboard
 

uhm, it really really really depends on what games you play, for the most part two 3870s do better than 2 880gt 512, but individually the 3870s will hardly ever beat a single 8800gt...scaling in crossfire tends to be much better than in SLi, however, a few games take significant drops in performance over a SLi or even a single card...so just do the research on which games you play most and what you will benifit from the most, Toms Hardware has benchmarks you can look at, so do many other sites, but just do your research, it will probably be faster than asking a bunch of fanboys their opinion.

thanks for that seems that a single 3870 will do for now and see what happens in the future.