you beat me to the punch I was going to recommend the 310 it has the same weight as the 290 but more power and is still under the 400 bucks. I think it makes the most sense out of the 290/310/390 family as far as weight vs power vs price. Although I was also going to recommend the 359 and all the benefits have been mentioned for only 40 bucks more although I don't know if that includes shipping. The bottom line is I think you made asound choice and I'm glad to see you chose the 18" bar.
Lucky