If you do a Google search "review proto SLG" you will find a great review by TechPB on YouTube. If I remember he actually tests that marker in a woodsball environment but also says somewhere along the line that he would be happy to take the marker onto the tournament field. It is electronic, has all the right programme modes to deal with pretty much every type of play. The review is the 2008 model, the 2009 UL (or Ultralite) model adds a few features which I think will tick all your boxes, so to speak. Keep an eye on the for sale forum, they pop up for various amounts but probably £100/£120 or so, BZ Paintball have them for £209 brand new.
I've mentioned Dye/Proto only because as a family we have a PMR09 and the new NT, but look at other brands with a good rep, thinking Planet Eclipse for example.
Piece of advice though, doing it on the cheap will ultimately end up the most expensive way of doing it. Markers are not great investments, markers I've sold after a bit of use have lost me money, just the way it goes. So rather go for a marker that performs well, is supported by a good brand and keeps you happy for a while so that you don't have to sell and upgrade.
OR,
you may consider one of the earlier Dye Matrix, DM and PM series, or even a Proto PMR, 09 model (08's and earlier are a bit plastic'y). A good DM5 (2005 model) for example will serve you well and you'll get one for £100 odd. But, with older markers get some advice from someone with a bit of experience, get them to check it out before buying and make sure it shoots properly and has useable electronics, the sport has changed over the last 5 years, electronics can be upgraded to keep up but it does cost.
STAY AWAY FROM LOW COST BLOW-BACKS, don't know about the VL specifically, but they hit the paintballs very hard and will break tournament grade or good grade paint. They are fine for occasional use at the local field, but if you get even remotely serious about the sport you will find they under perform and you'll find yourself wanting to upgrade.