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Road Warrors need about 100-120 GB of space on an SSD drive that will start up your system in 1/4 to 1/2 of the time it takes a regular hard drive.
An Intel SSD drive.
Another option is a hybrid SSD drive/hard drive. The Seagate Momentus XT includes a 4 GB SSD that speeds startup while the disk offers capacities up to 500GB.
Simply adding memory - upgrading to 4GB RAM can really help performance.