I agree that you need a hard drive, but I'm not completely sold on SSD yet. They're very expensive given the storage capacity and there are still quality issues.
Once they're closer to $1 per gigabyte, I'll be interested.
The $300 i spent for a 8x10x12 CD burner is a constant reminder to me that things always get cheaper.
But if the SSD will meet your needs and is in your budget, then it's a great option.
Whatever you decide, make sure you make regular backups!!!