Aside form there being little point in changing those from Manual to Automatic, if they are required and are set to Manual then they will start. So you are starting them automatically and that will use more memory.
Well basically I believe these handles are how the system knows where things are in memory and the more memory you use the larger this would become (partly due to your change if the service would otherwise be stopped/manual).
With only 2GB on a win7 x64 system you would really benefit with more RAM as you are already running at 75% of that leaving little reserve. Another 2GB would make a lot of a difference in overall system performance and 64bit OSes can manage even more than 4GB if necessary. Unless you have some applications that would benefit from greater amounts of RAM (video editing, etc.) then more than 4GB would make little difference over that quantity.
The increase in handles can also indicate an application with a memory leak problem.