1×9 is just as good as 1×10, its only one gear easier and not worth splashing all that cash if your 1×9 stuff is in good order. give it a try with your existing setup before you commit.
im running a e13lg1+ on one bike which works well but can rub a little at the very top and bottom of the cassette. very secure and light for a full guide.
ive got a mrp g2 on another bike, just as good if not better than the e13 as it rubs less.
ive got a e13 srs on my dh bike, a bit heavier but simple and secure.
mate has the superstar full guide, i dont like the lack of bash protection and he says it rubs a little but for the money its great.
my brother runs a top only superstar guide on a hardtail. chain stays on most of the time but he did lose it a few times on rockier stuff in the lakes.