Check here for a list of routers that could run DD-WRT v24 firmware. And follow this instruction to turn the router into a repeater bridge with wireless connection capability.
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Dell Dimension 9200 | Intel Core 2 Quad Q6600 (2.4Ghz) | 4x1GB DDR2 | 256MB nVidia GeForce 8800GT
Dell Inspiron 640m | Intel Core 2 Duo T7200 (2.0GHz) | 2x1GB DDR2 PC2-4200 | Intel GMA 950
Intel P4-C 3.0GHz | ECS 865PE-A | 3x512MB PC3200 | 128MB PNY GeForce 6600GT
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