I am getting to the point now that i really can't delay upgrading my computer for much longer. Opening a RAW image from my 5dmk2 to edit in Lightroom takes minutes (i'm not joking), and i now should probably accept that this isn't ideal 
My current computer is a MacBook 1.8ghz CoreDuo with 2gb RAM. It's an original MacBook (bought a few days after they were introduced for the first time), and is now 5.5yrs old. I should say though that the following items have been replaced: lower case, keyboard, mainboard, ram, hdd, battery, charger. The DVD stopped working years ago, so the only original and working pieces are the screen, and screen surround
My problem now is that i have several options, and i'd like to work out which suits me best. Here are the un-changable things:
- I need a Mac
- I much prefer laptops (even though they rarely leave the desk)
- 1280x800 is really pushing it as a screen res (that's what my current MacBook has)
- It needs to last me for many years
- I have a very limited budget, and ideally want an initial purchase of around £1k
Either the MBP base model, or MBA base model seem ok to me (price wise). However, the MBP has a low res screen (the MBA doesn't), and the MBA has very limited storage! If i was to go with the MBA, then how should i be running Lightroom as i will not have enough space for images on a 128gb SSD?
If anyone can help with my decision between the MBP and MBA, then that would be really helpful! and can anyone give me examples of Lightroom workflow where the catalogs aren't kept on the editing machine?

My current computer is a MacBook 1.8ghz CoreDuo with 2gb RAM. It's an original MacBook (bought a few days after they were introduced for the first time), and is now 5.5yrs old. I should say though that the following items have been replaced: lower case, keyboard, mainboard, ram, hdd, battery, charger. The DVD stopped working years ago, so the only original and working pieces are the screen, and screen surround
My problem now is that i have several options, and i'd like to work out which suits me best. Here are the un-changable things:
- I need a Mac
- I much prefer laptops (even though they rarely leave the desk)
- 1280x800 is really pushing it as a screen res (that's what my current MacBook has)
- It needs to last me for many years
- I have a very limited budget, and ideally want an initial purchase of around £1k
Either the MBP base model, or MBA base model seem ok to me (price wise). However, the MBP has a low res screen (the MBA doesn't), and the MBA has very limited storage! If i was to go with the MBA, then how should i be running Lightroom as i will not have enough space for images on a 128gb SSD?
If anyone can help with my decision between the MBP and MBA, then that would be really helpful! and can anyone give me examples of Lightroom workflow where the catalogs aren't kept on the editing machine?
