would be better if you can state down what you are going to use your laptop for mainly

hi guys,
My MAX budget is rm2100 and i need to use it for:
1. programming  (java-related framework) (top priority)
2. some spreadsheet, documents etc
3. internet. i don't play games on notebook.
4. Win XP and Linux only. i don't need vista.

That's all. I'm quite confused about the processors coz based on my research, for my budget, it's only limited to AMD Turion and Intel Core Duo. I have no any idea which 1 suits my specs better as my main concern is to do my programming work.
Well, in terms of RAM, 1GB would be great but current specs mostly are 512MB.
In terms of looks, I would prefer the lame black business looks like the Compaq rather than Acer Inspire series. But, this is not my main concern at the moment.

Based on my research:
Possible models are as follows:
Compaq Presario V3614AU,
Compaq Presario C714TU,
Compaq Presario C738TU,
Compaq Presario F731AU,
Compaq Presario V3658TU,
Acer Aspire 4520,
Acer Aspire 4710,
Acer Aspire 4710z,
Lenovo G400.

Any recommendation guys?

1. Brand - any will do
2. Budget - cheap one, RM2500-RM3000
3. Specs - C2D, at least 2GB RAM, 160GB HDD, integrated GC if possible, bluetooth, wifi etc
4. Size - any size will do
OK, this laptop is for normal use, internet surfing, microsoft office, programming, music and movies, I would like to have a laptop that has a long battery life and less heat since I would like to on for 24hour, if possible I wan 2-3years warranty for the laptop.

So any suggestion? I am noob in laptop!