I have to of course always agree with what Steve says but I do have something to add.
I have used a G5RV for years and it is my standby antenna and I use it mainly for 40 and 80 meters. It is a cloud burner for sure at my low heights (30 ft) that I have it at here in town but it does a good job for local chats on 40 and 80 as Steve says. I also have a Icom 746 and I do not have to use the external tuner with the G5RV, the tuner inside the 746 seems to tune it on all bands just fine.
I do not have a Gap, Butternut or Hustler vertical but I have friends in town that do and they all do a fine job. The only thing I can say about them is they are weak on 80 meters and narrow on 40 and 80 both for band width.
I do have a couple of thoughts on what you could try though. I have had an old CB antenna called a A99 or Antron 99 for years also and it is a cheap $39 fix for the higher bands (10,12,15,17..weak on 20) and then the G5RV could be used for the lower bands (20,40,and 80). My A99 makes my G5RV look bad on 10 and 12 and then on 15 and 17 it starts to get more even and then on 20 the G5RV is better for sure. I say this because I think my A99 stays up with those $200 and $300 dollar verticals on 10,12,15 and 17. So since you will need a 30 foot support or so for your wire (G5RV or the like) then put a 39 dollar fix on top of it...it may surprise you. Copper has the cheapest price for these.http://www.copper.comhttp://www.copper.com/cgi-bin/checkitout/checkitout.cgi?catalogSTORE:CKIE:prodA65-00002
I think you are just looking for some suggestions and thoughts so here is another one. If I was going to spend $200, $300 or more for a vertical antenna (and again they are good too), I think I would invest my money in a mini-beam. There are a few on the market like the Cushcraft MA5B or the MQ-2 TGM (these are small beams with little area needed). I think for $250 the CC MA5B would be hard to beat and they work well. http://www.eham.net/reviews/detail/340
Of course only a small TV rotor is needed and one could even use a small tower or pipe for support and again use the wire for low bands. My experience with verticals (good for DX no doubt) is that in town here they are noisy and the horizontal position of the beam or wire has a quite receive. You also can null noise and QRM out with the mini-beam.
Ok that is my 2 cents....Good Luck and hope to hear you on the bands.
73 de KB9UMT Don Peoria IL
emails welcome KB9UMT@ARRL.NET