The reason why people favor the GS is because they are 3-chip and native 16:9.
Do you have a fast computer (3ghz or 3000 + )? If not you will need to upgrade if you want to shoot HDV, you'll need as much as you can throw at it. If you can't afford that then get what you can afford, or get a cheapo, learn as much as you can about it, then rent a better camera like a DVX or XL2 or something for your shorts. The other option would be to buy the HC1 or this new Sanyo that is coming out or something and shoot in DV mode or in HDV and downconvert on capture. This will produce a very very nice image and then you have the hd version for later if you want it.
Theres no possible way you can ask people to tell you what is better - a 1 chip CMOS camcorder that resolves 1080i vs a 3-CCD 480 camcorder. They are in totally different leagues.
In the end, its a personal choice, one that will likely last you awhile unless you sell it, and nobody can tell you what you need out of a camera. Further I highly recommend asking yourself what your immediate goals are, testing out the cameras in question, and doing as much research on them as possible.
Also, dont forget to get a mic or two for whatever camera you buy. Sound is important too.
As for your last question, "comes out really grainy". If you are talking about a low light situation, then you are probably referring to gain, which is your camera's electronic ability to compensate for light lower than its capabilities allow (ie. lux rating). The HC1 is terrible in low light. You need at least some amount of light for the HC1 to be effective, although I tested a GS200 a while ago and I wasnt particularly impressed with its low light capabilities either. If you are saying it looks grainy in regular light, I can't help you there, that could be a lot of problems.