I'll second the Q500. Depending on your expectations, a Lanier Dominator 500 is a great choice. It can be built V or conventional tail and is likely the fastest thing at your local field with a good 46 on it. They are not competitive with the current higher end race kits, but they are great sport racers. Price is about $70 plus shipping direct from Lanier.
http://www.lanierrc.com/lrcprivate/
If you want a delta, Mike Connor may still have some of his Screamin' Demon kits left, there is a build thread in this forum. I have one and it is a nice kit, and reasonably priced.
http://www.rcuniverse.com/forum/m_6034143/tm.htm
http://www.rcuniverse.com/forum/m_6558728/tm.htm
Mark