you can get the new zino with the mobile quad phenom and i think 5450 ati video. if you are talking the first gen zino, the fastest it came with is the 6850e 1.6ghz dual core. but it can take faster, like the 4850e, but it is recommended you download and use the amd overdrive utility to lower the voltage so that the tdp of the processor is lower, the 6850e is 22w, the 4850e before using the amd overdrive is 45w.
mydellmini.com in the forums has a good review of the zino. i have the first generation and use it for light gameing. i just got a 2nd one off theoutlet with the 1.5ghz dual core for $260 ish shipped after using a 20% coupon.
i think the newest version of the zino with the phenom and 5450 would suit you well, i believe its priced at 650.