Dimitrios,
Actually I think Holmz is mistaken and might be assuming that the SDL3 comes with some small amount of logging memory as standard. In fact it doesn't - you must buy the 16MB logging "upgrade" if you want to do any logging at all - even if you might only need 500Kb. Without the logging upgrade, the SDL3 will only work as a display, it will not do any logging.
There are many other budget alternaitves that will log what you want for much less money, but the Motec dash range & I2 software really are nice to use and exceptionally powerful. Maybe a 2nd hand Motec might be an option?
For a budget system recommendation, have a look at the AEM AQ1 (~$USD400), It will not do any display but will log all the sensors you require. I have recently installed one in a drag car and think its probably the best budget system available and it's software is really good.