Poker Tracker is IMO invaluable, and especially for someone playing at your level. I would imagine ,from reading articles in magazines, that all other serious pros use technology to a greater or lesser extent.
WIth Poker Tracker you don't have to spend hours looking over data, although i'm you can if you want, but it lets you re-play hands to see what odds your were getting, see which hands are costing you money and which hands are making you money.
I think you still can get the full program for a free 1000 hand trial (free download) which is plenty enough to let you get the low down on your trends. But with unlimited hand histories what i have started to do is open all the
Ladbrokes tables and leave them collecting data for hours on end on all the other tables at my buy in. This then (after a decent while) will give you lowdown on who are the successfull players and who are the ones you can make money from.
Poker Office I also have , but don't use as much, although i may well do in the future.
Game Time is another free Poker Tracker addon that gives data on all your current table opponents. Which would be useful providing you don't play more than 2 tables at once.
GaF is a complete techno-slave so I'm sure he will enlighten you even further
In the meantime go here
http://www.pokertracker.com/ and download it immediately !! you won't regret it