Wirelessly posted (7290: Mozilla/2.0 (compatible; MSIE 3.02; Windows CE; PPC; 240x320) BlackBerry7290/4.0.2 Profile/MIDP-2.0 Configuration/CLDC-1.1)
It realy all depends on coverage in your area and if or not you need A world phone.
That's what it comes down to.
BTW , I would say GO with the 8700 I think that latency is pretty much the same because the 30 is like not even able to utilize the full potential of the upgraded CDMA's speed.
And even with tethering you still have 2 or 3 bottle necks before the connection hits your PC/Lappy or whatever.