Since I'm going to war all by myself, I've been considering ships to use. In groups your choice of ship is dictated by the needs of the group and the style of PvP you are looking for. But solo is much more refined as you need to accomplish all tasks by yourself.
Introducing the Holy Triangle of Eve ships:
Gank: DPS, tackle, EWAR, all the offensive weapons to keep your enemy in combat and hurt him.
Tank: Shields, armour, speed, EWAR, all the ways you keep yourself alive.
Cost: more accurately, cost efficiency. Ideally you want to minimize the cost to replace the ship.
All ship setups measure differently on the triangle. In gangs you might focus on one vertex or even one part of a vertex as a part of the group. For example, a Falcon provides scouting and EWAR while a Tech 1 Rifter maximizes cost efficiency as a disposable tackler. In solo flying you typically want to attempt to maximize all three points on the triangle as much as possible.
Tech 1 frigates maximizes the Cost point at the expense of the other two. Tech 2 frigates decrease the Cost efficiency but are slightly better in the other two.
Tech 1 cruisers with tech 1 gear are very cost efficient and some damage and defense, but with Tech 2 gear that cost efficiency decreases while gank and tank increases. Tech 2 cruisers increase the gank and tank even more but seriously reduce cost efficiency.
However the best bang for your buck is the Battlecruisers and Battleships. With lots of slots for both tank and DPS while still having insurance that covers the cost of the hull, they are the ship of choice most often for solo combat pilots. Since battlecruisers use cruiser sized weapons and defenses, they tend to be slightly more cost effective than battleships at the trade off of less overall damage and tank.
So I'll probably faced with these choices, I'll probably get some cruisers setup in various regions ready to go. Maybe a battlecruiser or two here and there for more "Omph" when I need it.
DISCLAIMER: These diagrams are in no way scientific or support by facts or figures. It is my "back of the napkin" opinion.