SPS, SORC, and SH are all great choices... I just retired my 78 Ghost sentinel in favor of an SPS. I already have a 77 sorc and use my cousins 75 SH from time to time. SH is arguably the best due to its arsenal of spells, silence, etc, but it doesn’t have the good AOE spell at 58 that SPS and Sorc get. That’s the best AOE spell in the game.
SPS has interesting tools in its tool bag as well. Among them are powerful DOT’s and slows, which will F up any high defense char. While normal spells lose their damage against high magical resistance, like someone using ultimate defense, your DOT will do its full damage. This should be worth noting.
SPS will be formidable in pve and PvP. Just make sure you have an SE to recharge you. You get body to mind, but it won’t be enough. The best solo char is elven summoner, hands down, no contest. CDL damage sucks compared to your normal nuke. They changed the damage and mana cost of your strongest nuke as a mage class, upped the damage, and lowered the cost, CDL can’t keep up. It wasn’t modified to reflect this change so it’s not nearly as good as it once was conparitavely speaking.
All that said, I’m making a trio of nukers. SH, Sorc, and SPS. I’ve really enjoyed the SPS so far.