For Solidwork, you need a reasonable GPU.
For your budget, forget about 13" or less (or thin and light for that matter), stick with normal 14" laptop.
Your choice is simple. Hip and trendy, but suffer like hell when program run slow. Or bulky and dull, but at least you get things done
Acer
E1-472G-54204G75k, i5- 4200U + Nvidia GT720M@RM1899, 4GB, 750GB, W8
E1-472G-54204G50, i5- 4200U + Nvidia GT720M@RM1699, 4GB, 500GB, FreeDOS
Dell
Inspiron 14R, i5-4200U + Nvidia GT740M@RM1849 [2.32kg], 4GB, 500GB(5400rpm), Linux, 6 cell; W8@RM2049
Vostro 5460, i5-3230M +Nvidia GT630M@RM1899[1.54kg], 4GB, 500GB(5400rpm), Ubuntu 12.04, 3 cell; W8SL@RM2099
HP
Pavilion 14-N059TX, i5-4200U + Nvidia GT740M@RM2099[2.03kg], 4GB, 750GB, W8
Lenovo
G400s, i5-3230M + Nvidia GT720M@RM1799, 4GB, 500GB, W8
Prices are RSP, negotiable.