Is you TV HD? If so there isn't that much HD content on there right now - BBC HD, a little bit of ITV is in HD, that's about it.
Or has your new TV got freesat built in? If not then you may want to wait until the Freesat+ PVRs come out before deciding to invest.
Other than that, look at the channels you can get and see if you'd watch them. If you already have freeview DTT I don't see much advantage unless you want a bit of HD:
101 BBC One Entertainment
102 BBC Two Entertainment
103 ITV1 Entertainment
104 Channel 4 Entertainment
106 BBC Three Entertainment
107 BBC Four Entertainment
108 BBC HD Entertainment - High Definition
110 BBC ALBA Scotland - Gaelic Language
113 ITV2 Entertainment
114 ITV2 +1 Entertainment
115 ITV3 Entertainment
116 ITV3 +1 Entertainment
117 ITV4 Entertainment
120 S4C (Wales) Entertainment
121 Channel 4 + 1 Entertainment
122 E4 Entertainment
123 E4 +1 Entertainment
124 More4 Entertainment
125 More4 +1 Entertainment
135 Zone Romantica Entertainment
136 Zone Reality Entertainment
137 Zone Thriller Entertainment
138 Zone Horror Entertainment
139 Zone Horror + 1 Entertainment
140 BET ??
200 BBC News News
201 BBC Parliament News
202 S4C2 (Wales) News
203 Al Jazeera English News
204 Euronews News
205 France 24 News
206 Russia Today News
251 TWC Fight Sport
300 Film4 Movies
301 Film4 +1 Movies
302 True Movies Movies
303 True Movies 2 Movies
304 Movies4Men Movies
306 Movies4Men2 Movies
402 Wedding TV Lifestyle
406 Information TV Lifestyle
411 Overseas Property Lifestyle
450 Men and Motors Lifestyle
451 Audi Channel Motoring
500 Chart Show TV Music
501 The Vault Music
502 Scuzz Music
503 Bubble Hits Music
504 B4U Music Music
509 Zee Music Music
600 CBBC Kids
601 CBeebies Kids
602 CITV Kids
603 POP Kids
604 POPGirl Kids
605 Tiny POP Kids
606 Kix! Kids
650 Teachers TV Specialist / Education
690 Inspiration TV Specialist
800 QVC Shopping
801 price-drop tv Shopping
802 bid tv Shopping
803 Pitch TV Shopping
804 Pitch World Shopping
805 Gems TV Shopping
806 Celebrity Shop Shopping
807 Shop on TV Shopping
810 Rock & Co Shopping
812 Simply Shopping Shopping
813 Best Direct Shopping
851 Netplay TV Gaming channel
861 Gala TV Gaming channel