What is the info on projectors?

I am looking to get one for my work as we need it for software presentations etc. Preferably we need something around 1400 x 1000 (obviously not exact).

LN14081 says its native is XGA (1024 x 768), but it can accept an input up to SXGA+ (1400 x 1050).

Obviously at native it would look the best, however, the res is too low... could I then change the res to 1400 x 1050 and it would look ok...? Will there be a huge amount of quality lost not using the native res...

sorry I really don't know the ins and outs of projectors...

All help would be great.