I concur with LikeLinus. If you are even remotely able to use your hands, putting a parts express kit together should be very easy and the sound will easy beat the pre-mades in your price range. With everything cut to fit, it really is a no-brainer.
If you have a little more facility with wood working, you could consider something a little more ambitious. I have built larger structures before (an outbuilding, and some major remodelling work on my house). But I've never done any "fine" wood working (i.e. making something where reasonably precise measurements were pretty important and wouldn't be covered by sheetrock or sheathing). However, I'm just about to finish my first folded horn (a Bill Fitzmaurice design). I don't know how it will sound, although most who have heard them rave about the performance (especially given the end cost). The build has been a bit slow since I am new at this and am taking great care. However, it's been very straightforward. BTW, I'm building with nothing other than a circular saw, a screw gun, a framing square, a measure tape, and a few clamps (I borrowed my dad's jig saw for ten minutes to cut the baffle and access panel). It's been a really awesome learning experience and if the end result sounds anything like BFM's fan say, I will certainly be building some more.