You can get the other two microsoft ones, mike and mary from jim kitchins' site, ---- but they are only marginally better than the default microsoft one unfortunately.
I myself got scansoft daniel from www.nextup.com, --- -which works very well but did cost money.
As to stratogy, ---- well, there are so many strategical options for the game depending upon what combination of jobs you have, it's unbelieveable.
As a couple of general tips, remember you can use numbers to targit body parts, ---- both the enemies for attacking and your groups for healing. This can help a lot, ---- particularly against zombies or when using certain spells like ice blast.
Also, try and find jobs that combine together well, ---- for instance, the assassinate skill does huge damage to targits who are asleep, paralized, grappled or entangled in webs, ---- so having a bard and assassin in your party can be a pretty deadly combination.
Also, remember that using lots of abilities like flurry and whirlwind can take time, and leave your characters open to attack, ---- where as just attacking normally is fairly fast, so boosting your attack and defense can help, --- -for instance I just had a party of monk assassins go right through the dungeon to level 20, ---- where the game currently ends, I'd maxed all their attack/defense skills like crytical hit, iron skin and combo, but hadn't even touched their abilities like focus.
Bare in mind though this is just personal opinion of course, ---- another person on the entombed mailing list uses focus and break limb quite effectively for instance.
it's one of the games' strengths that there are so many different ways to win.