LTE dongles will not be commercially available in volume until 2010. Chipsets for LTE phones won't be available in volume until 2011 at best. Verizon will also be late, so the net of it is you won't see widespread coverage and widespread device availability until the 2011-2012 timeframe anyway. Verizon will be selling EV-DO phones, dongles and netbooks for several years to come, there is no "changeover from CDMA to GSM in 2010" in any way and their CDMA network is not going anywhere any time soon.
Furthermore, Verizon isn't "skipping" HSPA since there isn't an upgrade path for them unless they wanted to forklift upgrade their 1x/DO network to HSPA which is never going to happen. AT&T on the other hand has an easier upgrade path from HSPA to LTE since the HSPA packet core can be upgraded to support LTE so they are really just looking at a RAN upgrade.
The net of it is that you won't be doing much with LTE for 2-3 years, and while Verizon will undoubtedly be first to market with LTE in the US AT&T won't be terribly far behind.