EVERYONE seems to go for a spartan (Oh noes! a tougher land raider to move your already 800+ point death star! what ever will we all do!), and unless you are gonna run said deathstar, I would either avoid it (since it costs a ton) or build a list around supporting it.
Deep striking is stopped by one of the two legion RoWs (
https://1d4chan.org/wiki/Warhammer_40,000/Tactics/Space_Marine_Legion_List_%2830k%29#XVIII_Legion:_Salamanders) but really, these complaints are fairly asinine since you SHOULD be building what you think looks cool/ may play fun/is fluffy rather then worrying about what would be 'good' (99.9% of all units in 30k are good. some are Better, but there's very few useless units) What I would reccomend is picking 1 or 2 themes for your army: Flamer spam, transport troops, terminators, etc. etc. and building to be able to play one of those themes.