Questions on bankroll swings, win streaks, good sites, etc.

Hi all.
I wanted to throw out some questions and I would seriously like any and all persons to respond to this (I really don't care if you have 1 post or something, just let me know what you think).

1) what are people's swings in bankrolls, specifically for SNG? Mine tends to be streaky...lots of wins in a short amount of time or bunches of losses at a time. Are most people here playing one type of buy in tournament ($10 tourneys, $20 tourneys, etc) only, or do most people here bounce from a range of tournament buy ins? I currently play mostly at the $25 level at stars, but i also play at the 55 level as well...is this a mistake, especially when considering how this might affect the swing in my bankroll?

2) Do most people here play SNGs that have the longest possible time for blind changes? Are the "turbos" on Stars considered "crap shoots", even for SNGs?

3) Has anyone ever had more success at a certain site rather than another? Should I be keeping multiple bankrolls at different sites?? Is there a big difference in anyone's opinion? Please keep in mind that I will be playing for multiple hours everyday.

4) Any good software recommendations out there that are *easy* to use...I would LOVE to keep track of all my internet poker info, but for right now I simply keep track of my win/loss ratio.
Thanks so much for helping me with my game!