I have both Opera Mini and Bolt browsers on my phone and i find the Bolt browser the easiest and quickest. Still holding out for Skyfire whenever that comes out...
Might also be worth a go to update the OS version on your device - i had a few niggles with Wi-Fi when i first switched it on yet after a software update all is well!
Had: 8700g, 9000, 8220, 9500, 8110, 9520, 8520, 8800, 9800, 9000 (again..)
Have: 9300 Curve (until the 9900 is released)