Thinking of buying a dell 640m (e1405), but I have a few questions

So I have my choice of a new notebook narrowed down to the dell e1405 (or 640m like it is called here in Canada) or the hp dv2000t. It turns out that the HP isn't available in Canada so the choice has been made for me. I have a few questions about which options I should get it customized with and I am hoping that somebody might be able to help me make the right choices. Here are my questions:
1. Is it important to get 667 RAM or just go with the 533 RAM that comes standard. The core duo and core 2 duo procs both have a FSB of 667 MHz. Why is 533MHz RAM even an option? Won't running at a slower speed significantly slow down your system?
2. Should I really pay $100 more for the core 2 duo? The only reason I would do so would be so I could run the 64-bit version of vista but from the research I've been doing it sounds like the 64-bit version will have driver compatibility problems and won't be any faster anyway. Might as well save my money and run the 32-bit version. If someone could add some more insight into this issue I would appreciate it.
3. Do I need bluetooth? Are there any advantages to getting a bluetooth mouse over a wireless mouse that has a receiver that plugs into USB? Can bluetooth be used for anything else useful? I have a bluetooth cellphone, could I transfer files to my phone over bluetooth? Sorry if this is a stupid question but I don't know much about that sort of thing. If I choose not to install the bluetooth option is it something that I could easily add later if the need arose?

I have a few other questions but I think that is enough for now. Thanks in advance to anybody who helps me out by adding their $0.02.

 

1) no it will not, the cpu will not be affected, and the longer latency times on the 667 take away the bulk of the advantage it has over 533

2) looks like you have that figured out, unless you go with the t7200 and up all your getting is 64 bit ability

3)thats up to you, if you have a need for bluetooth get it, if not, dont,

 

Thanks for the quick reply. Thats good to know that 667 RAM isn't going to make a difference, that will save me some money.

 

I've been thinking more about the 533 vs. 667 memory thing and I was wondering if anybody has seen an article with the two types of memory compared? With onboard video the RAM will be used as VRAM too so slower memory will affect this also. Its not that I don't believe you iceman, I would just like to see some data if anyone has a link.
Also, If I went with core duo and then wanted to upgrade to core 2 duo down the road can I just replace the processor? Does anybody know if the motherboard used in these will support the quad core core 2 processors when they are available for notebooks? That would make it pretty future proof if I could just switch out the low end core duo I'm planning on going with now and add in a 64-bit quad core processor in a couple years. By then the 64-bit version of vista might be worth using. Sorry if I'm rambling, other opinions are appreciated.

 

use the forum search function, a good place to look would also be toms hardware guide, look at the 945 chipset and ddr2 perfomance,anandtech tech would also have some good benchmarks for you you can replace the cpu, but you will void the warranty, I seriously doubt kentsfield will work on current chipsets

 

I checked out some of the source you suggested and everyone is in agreement that 533 is no different than 667 until the latency on 667 RAM improves. I just had to make sure.
Since we were discussing kentsfield, I looked into motherboard compatibility on desktop system and it d oes work in current chipsets including 965, 975 and 945. Some motherboards will need a bios update and some will need to be revised but it will work on current motherboard and seeing how this book uses a 945 chipset upgrading to kentsfield (or whatever its mobile counterpart will be called) is a real possibility in the future. Apparently the desktop chips are very power hungry compared to the core 2 duo so it might not be a good idea to do so anyway. It just makes me think that it would be a good idea to just get a core duo now then upgrade when there it a better option than core 2 duo (and at a time when my warranty has expired anyway).