postdiction wrote:1a) Reliability: This is going to be my only machine. I know for reliability with laptops is asking a lot but, I would like to know which model has the least number of known problems
The T4x in general, because of the GPU problem, is not a very reliable series, but 15" T43s and 15" T42s manufactured in Spring 2005 and later seem to have a considerably lower failure rate than other models, followed by 14" T43/T43p's.
postdiction wrote:2) CPU speed
Anything over 1.8GHz Dothan should be good. 2GHz CPUs can be had in T42/T43 models easily. Beyond that they tend to get hotter and more pricey.
postdiction wrote:3) graphic card speed/mem
The FireGL T2/FireGL V3200 models on the T42p/T43p will provide the best performance, however they tend to run noticeably hotter, have a higher failure rate because of that, and the machines are more expensive. I would advise to go for a Radeon 9600-based T42 or an X300-based T43.
postdiction wrote:4) Screen: I need a clear screen with no spots and max resolution for either 14 or 15 inch
SXGA+ (1400x1050) can be had on both. UXGA (1600x1200) only on 15" T42p/T43p models.
postdiction wrote:5) Optical drive: would like dvd burner but will settle for cd burner/dvd
Not a problem to get a DVD burner, and you can always upgrade later. DVD burners from T60/T61 also work.
postdiction wrote:6) battery life
Again I would advise against the FireGL models in the T42p/T43p. Consider a 9-cell battery, if you don't mind the extra weight and bulk.
postdiction wrote:7) Ram: 512 will do
You should probably go for 1GB, though.
postdiction wrote:So I am thinking:
2ghz, 64mb vram, 512 ram, with a good highest resolution possible in the form factor screen
without hard drive to save money?
how much would something like this cost?
14inch vs 15inch? Are 14inch models usually cheaper?
I agree with what you are thinking. In general, as sjthinkpader said, the 15" models are noticeably bigger and heavier, so you should determine how much portability you need. If it is mostly a desktop replacement, go for 15" because of the excellent wide-view-angle IPS "Flexview" screen, and the lower failure rates. But if you plan to lug the machine around a lot, consider a 14".
Yes, the 15" do tend to be more expensive because of the better screen. At least when they were new they were. Of course, when buying used, second-hand machines, all bets are off, and prices are pretty much random.
As far as the other components - I'd go for a T42/T43, non-P, with Radeon 9600/X300, and SXGA+ screen (in fact, all such machines will have SXGA+, regardless of 14" or 15").