If you want 4G but don’t want to spend too much money, Optus thinks it might have the answer, with an LTE exclusive coming in the form of a 4.5 inch Samsung smartphone that sits in the middle yet doesn’t try to compromise on features.

Launching as part of the Galaxy range, the Galaxy Express isn’t like yesterday’s Optimus F5 prepaid 4G phone, as it sits in a post-paid world with various plan options.

Look past the payment, however, and you’ll find a device supporting a dual-core 1.2GHz processor, Adreno 305 graphics chip, 8GB storage, 1GB RAM, Android 4.1 “Jelly Bean,” Bluetooth 4.0, WiFi 802.11 a/b/g/n, support for a microSD slot, and a connection to the Optus high-speed LTE network.

Screens are a big deal, and for this model, Samsung is equipping a 4.5 inch Super AMOLED display supporting the Galaxy S2’s resolution of choice, 800×480, with a 2000mAh battery keeping it running.

Unfortunately, there’s no outright price, but keen buyers can find it at Optus this week on various plans in both black and white.