Well a VL Triad is a simple blowback marker. I wouldn't go all crazy on it for upgrades yet because you will very likely dump it for a new gun in the next year or two.
Barrels... Barrels are tricky things, a lot of people say a lot of things about barrels and honestly, I've not seen a difference outside of the "nice" and "crap" categories. My Freak shoots like my Dye UL, which suspiciously shoots the same as my J+J, which is a clone of my friends macdev kit without all the inserts...
You can play your barrel 2 ways: I roll these days with a singular .689 bore size and very rarely change, I have a huge range of bore sizes at my fingertips but I always use the same ones. Tournie players use larger bores to not break shots in the barrel (.693+) but to them I'd say I've not broken paint in my barrel in 2+ years. Rec ballers seem to underbore, and use tighter paint to barrel matches to increase gun efficiency (less gap between the ball and barrel means less air pass by). Its up to you which you choose. If I were in your shoes I'd buy a single .689 dye UL back for your particular threading, (USED!) and a tip (Also used!).
Why used? Paintball has this funny curve for used gear, used anything is literally worthless. A dye UL new should cost you about $120, used you can get them for 40-50. Since you're not going to hold onto this gun very long, put the money you saved into a jar for other toys later.
Tips: As in barrel tips, theres a school of thought that barrels have a "control bore" which means that the ball's predetermined flight is for the most part dictated by the first 8" or so in the barrel. After this distance you want to have your porting to vent the air from behind the ball so it doesn't do any funny dances coming out of the tip. Realistically there isn't much with an 8" control bore, most out there is 6" and 6" is fine. Tip length is a different matter however. Tips come in a variety of lengths measured by the OVERALL length of the barrel when used. a 12" tip might be 6" and use a 6" back for instance. Most players use a 14-18" tip. I sit in the middle at 16", and wish I was a bit shorter than that, any future tips will be 14". I have an 18" tip on my angel, while great for pushing bunkers out of the way on the speedball field it is cumbersome to wield around in a good woodsball game.
Anyhow, thats my ramble on barrels, hope it helps. I think you'll be exceptionally happy with a 14-16" dye UL off ebay.