Here's the current range of Orange 3G handsets available in the UK.

Samsung Z500
Sony Ericsson K600i
Nokia 6680 (now £30 cheaper on some plans)
Nokia 6630
Sanyo S750
Sanyo S750i (yeah...)
LG U8150
Motorola C975
Samsung Z107

That makes a commendable nine handsets currently available, though only the top four are handsets I would personally recommend considering. The rest are early 3G handsets and as such will no doubt be retired once stocks are depleted or new models arrive to replenish the range.